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Finding the Fourth Proportional to 661,397.24, 912,732.36 and 389,477

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Solution

The fourth proportional to 661,397.24, 912,732.36 and 389,477 is: 537,480.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,397.24 : 912,732.36 = 389,477 : x
  2. Step 2: Convert to fraction form
    661,397.24/912,732.36 = 389,477/x
  3. Step 3: Cross multiply
    661,397.24x = 912,732.36 × 389,477
  4. Step 4: Simplify right side
    661,397.24x = 355,488,261,375.72
  5. Step 5: Solve for x
    x = 355,488,261,375.72/661,397.24
  6. Step 6: Final answer
    x = 537,480.71

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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.