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Finding the Fourth Proportional to 390,641.47, 539,125.41 and 237,690.79

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Solution

The fourth proportional to 390,641.47, 539,125.41 and 237,690.79 is: 328,037.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,641.47 : 539,125.41 = 237,690.79 : x
  2. Step 2: Convert to fraction form
    390,641.47/539,125.41 = 237,690.79/x
  3. Step 3: Cross multiply
    390,641.47x = 539,125.41 × 237,690.79
  4. Step 4: Simplify right side
    390,641.47x = 128,145,144,611.97
  5. Step 5: Solve for x
    x = 128,145,144,611.97/390,641.47
  6. Step 6: Final answer
    x = 328,037.74

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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.