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Finding the Fourth Proportional to 661,083.73, 912,484.72 and 389,309.28

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Solution

The fourth proportional to 661,083.73, 912,484.72 and 389,309.28 is: 537,358.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,083.73 : 912,484.72 = 389,309.28 : x
  2. Step 2: Convert to fraction form
    661,083.73/912,484.72 = 389,309.28/x
  3. Step 3: Cross multiply
    661,083.73x = 912,484.72 × 389,309.28
  4. Step 4: Simplify right side
    661,083.73x = 355,238,769,354.20
  5. Step 5: Solve for x
    x = 355,238,769,354.20/661,083.73
  6. Step 6: Final answer
    x = 537,358.21

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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.