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Finding the Fourth Proportional to 521,159.40, 780,426.90 and 342,700.20

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Solution

The fourth proportional to 521,159.40, 780,426.90 and 342,700.20 is: 513,187.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,159.40 : 780,426.90 = 342,700.20 : x
  2. Step 2: Convert to fraction form
    521,159.40/780,426.90 = 342,700.20/x
  3. Step 3: Cross multiply
    521,159.40x = 780,426.90 × 342,700.20
  4. Step 4: Simplify right side
    521,159.40x = 267,452,454,715.38
  5. Step 5: Solve for x
    x = 267,452,454,715.38/521,159.40
  6. Step 6: Final answer
    x = 513,187.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.