Home / 9,139.65-12,612.45-5,161.13

Finding the Fourth Proportional to 9,139.65, 12,612.45 and 5,161.13

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Solution

The fourth proportional to 9,139.65, 12,612.45 and 5,161.13 is: 7,122.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,139.65 : 12,612.45 = 5,161.13 : x
  2. Step 2: Convert to fraction form
    9,139.65/12,612.45 = 5,161.13/x
  3. Step 3: Cross multiply
    9,139.65x = 12,612.45 × 5,161.13
  4. Step 4: Simplify right side
    9,139.65x = 65,094,494.07
  5. Step 5: Solve for x
    x = 65,094,494.07/9,139.65
  6. Step 6: Final answer
    x = 7,122.21

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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.