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Finding the Fourth Proportional to 661,531.98, 912,953.97 and 389,781

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Solution

The fourth proportional to 661,531.98, 912,953.97 and 389,781 is: 537,921.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,531.98 : 912,953.97 = 389,781 : x
  2. Step 2: Convert to fraction form
    661,531.98/912,953.97 = 389,781/x
  3. Step 3: Cross multiply
    661,531.98x = 912,953.97 × 389,781
  4. Step 4: Simplify right side
    661,531.98x = 355,852,111,380.57
  5. Step 5: Solve for x
    x = 355,852,111,380.57/661,531.98
  6. Step 6: Final answer
    x = 537,921.25

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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.