Home / 9,138.12-12,610.80-5,159.40

Finding the Fourth Proportional to 9,138.12, 12,610.80 and 5,159.40

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Solution

The fourth proportional to 9,138.12, 12,610.80 and 5,159.40 is: 7,120.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,138.12 : 12,610.80 = 5,159.40 : x
  2. Step 2: Convert to fraction form
    9,138.12/12,610.80 = 5,159.40/x
  3. Step 3: Cross multiply
    9,138.12x = 12,610.80 × 5,159.40
  4. Step 4: Simplify right side
    9,138.12x = 65,064,161.52
  5. Step 5: Solve for x
    x = 65,064,161.52/9,138.12
  6. Step 6: Final answer
    x = 7,120.08

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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.