Home / 9,108.79-12,570.90-5,130.69

Finding the Fourth Proportional to 9,108.79, 12,570.90 and 5,130.69

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Solution

The fourth proportional to 9,108.79, 12,570.90 and 5,130.69 is: 7,080.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,108.79 : 12,570.90 = 5,130.69 : x
  2. Step 2: Convert to fraction form
    9,108.79/12,570.90 = 5,130.69/x
  3. Step 3: Cross multiply
    9,108.79x = 12,570.90 × 5,130.69
  4. Step 4: Simplify right side
    9,108.79x = 64,497,390.92
  5. Step 5: Solve for x
    x = 64,497,390.92/9,108.79
  6. Step 6: Final answer
    x = 7,080.79

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Half scale
Find fourth proportional to 18,217.58, 25,141.80 and 10,261.38
Double scale
Find fourth proportional to 9,109.79, 12,572.28 and 5,131.69
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.