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Finding the Fourth Proportional to 661,509.87, 912,772.96 and 389,631.90

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Solution

The fourth proportional to 661,509.87, 912,772.96 and 389,631.90 is: 537,626.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,509.87 : 912,772.96 = 389,631.90 : x
  2. Step 2: Convert to fraction form
    661,509.87/912,772.96 = 389,631.90/x
  3. Step 3: Cross multiply
    661,509.87x = 912,772.96 × 389,631.90
  4. Step 4: Simplify right side
    661,509.87x = 355,645,468,824.54
  5. Step 5: Solve for x
    x = 355,645,468,824.54/661,509.87
  6. Step 6: Final answer
    x = 537,626.85

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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.