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Finding the Fourth Proportional to 390,923.80, 586,374.90 and 124,700.20

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Solution

The fourth proportional to 390,923.80, 586,374.90 and 124,700.20 is: 187,046.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,923.80 : 586,374.90 = 124,700.20 : x
  2. Step 2: Convert to fraction form
    390,923.80/586,374.90 = 124,700.20/x
  3. Step 3: Cross multiply
    390,923.80x = 586,374.90 × 124,700.20
  4. Step 4: Simplify right side
    390,923.80x = 73,121,067,304.98
  5. Step 5: Solve for x
    x = 73,121,067,304.98/390,923.80
  6. Step 6: Final answer
    x = 187,046.85

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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.