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Finding the Fourth Proportional to 391,420.35, 586,959.57 and 138,616.83

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Solution

The fourth proportional to 391,420.35, 586,959.57 and 138,616.83 is: 207,864.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,420.35 : 586,959.57 = 138,616.83 : x
  2. Step 2: Convert to fraction form
    391,420.35/586,959.57 = 138,616.83/x
  3. Step 3: Cross multiply
    391,420.35x = 586,959.57 × 138,616.83
  4. Step 4: Simplify right side
    391,420.35x = 81,362,474,931.56
  5. Step 5: Solve for x
    x = 81,362,474,931.56/391,420.35
  6. Step 6: Final answer
    x = 207,864.70

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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.