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Finding the Fourth Proportional to 710,781.53, 980,904.89 and 388,513.31

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Solution

The fourth proportional to 710,781.53, 980,904.89 and 388,513.31 is: 536,162.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,781.53 : 980,904.89 = 388,513.31 : x
  2. Step 2: Convert to fraction form
    710,781.53/980,904.89 = 388,513.31/x
  3. Step 3: Cross multiply
    710,781.53x = 980,904.89 × 388,513.31
  4. Step 4: Simplify right side
    710,781.53x = 381,094,603,666.52
  5. Step 5: Solve for x
    x = 381,094,603,666.52/710,781.53
  6. Step 6: Final answer
    x = 536,162.78

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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.