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Finding the Fourth Proportional to 661,517.85, 912,962.43 and 389,671.32

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Solution

The fourth proportional to 661,517.85, 912,962.43 and 389,671.32 is: 537,786.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,517.85 : 912,962.43 = 389,671.32 : x
  2. Step 2: Convert to fraction form
    661,517.85/912,962.43 = 389,671.32/x
  3. Step 3: Cross multiply
    661,517.85x = 912,962.43 × 389,671.32
  4. Step 4: Simplify right side
    661,517.85x = 355,755,275,208.51
  5. Step 5: Solve for x
    x = 355,755,275,208.51/661,517.85
  6. Step 6: Final answer
    x = 537,786.36

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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.