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Finding the Fourth Proportional to 614,737.20, 921,121.65 and 389,694.90

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Solution

The fourth proportional to 614,737.20, 921,121.65 and 389,694.90 is: 583,918.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    614,737.20 : 921,121.65 = 389,694.90 : x
  2. Step 2: Convert to fraction form
    614,737.20/921,121.65 = 389,694.90/x
  3. Step 3: Cross multiply
    614,737.20x = 921,121.65 × 389,694.90
  4. Step 4: Simplify right side
    614,737.20x = 358,956,409,284.59
  5. Step 5: Solve for x
    x = 358,956,409,284.59/614,737.20
  6. Step 6: Final answer
    x = 583,918.48

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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.