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Finding the Fourth Proportional to 661,672.80, 912,677.76 and 389,511.18

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Solution

The fourth proportional to 661,672.80, 912,677.76 and 389,511.18 is: 537,271.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,672.80 : 912,677.76 = 389,511.18 : x
  2. Step 2: Convert to fraction form
    661,672.80/912,677.76 = 389,511.18/x
  3. Step 3: Cross multiply
    661,672.80x = 912,677.76 × 389,511.18
  4. Step 4: Simplify right side
    661,672.80x = 355,498,191,257.36
  5. Step 5: Solve for x
    x = 355,498,191,257.36/661,672.80
  6. Step 6: Final answer
    x = 537,271.88

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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.