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Finding the Fourth Proportional to 661,673.80, 912,679.14 and 389,512.18

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Solution

The fourth proportional to 661,673.80, 912,679.14 and 389,512.18 is: 537,273.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,673.80 : 912,679.14 = 389,512.18 : x
  2. Step 2: Convert to fraction form
    661,673.80/912,679.14 = 389,512.18/x
  3. Step 3: Cross multiply
    661,673.80x = 912,679.14 × 389,512.18
  4. Step 4: Simplify right side
    661,673.80x = 355,499,641,461.93
  5. Step 5: Solve for x
    x = 355,499,641,461.93/661,673.80
  6. Step 6: Final answer
    x = 537,273.26

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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.