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Finding the Fourth Proportional to 391,154.28, 539,700.38 and 221,388.40

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Solution

The fourth proportional to 391,154.28, 539,700.38 and 221,388.40 is: 305,463.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,154.28 : 539,700.38 = 221,388.40 : x
  2. Step 2: Convert to fraction form
    391,154.28/539,700.38 = 221,388.40/x
  3. Step 3: Cross multiply
    391,154.28x = 539,700.38 × 221,388.40
  4. Step 4: Simplify right side
    391,154.28x = 119,483,403,607.59
  5. Step 5: Solve for x
    x = 119,483,403,607.59/391,154.28
  6. Step 6: Final answer
    x = 305,463.62

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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.