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Finding the Fourth Proportional to 390,691.20, 586,036.80 and 141,340.80

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Solution

The fourth proportional to 390,691.20, 586,036.80 and 141,340.80 is: 212,011.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,691.20 : 586,036.80 = 141,340.80 : x
  2. Step 2: Convert to fraction form
    390,691.20/586,036.80 = 141,340.80/x
  3. Step 3: Cross multiply
    390,691.20x = 586,036.80 × 141,340.80
  4. Step 4: Simplify right side
    390,691.20x = 82,830,910,141.44
  5. Step 5: Solve for x
    x = 82,830,910,141.44/390,691.20
  6. Step 6: Final answer
    x = 212,011.20

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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.