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Finding the Fourth Proportional to 647,695.40, 971,543.10 and 423,309.20

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Solution

The fourth proportional to 647,695.40, 971,543.10 and 423,309.20 is: 634,963.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,695.40 : 971,543.10 = 423,309.20 : x
  2. Step 2: Convert to fraction form
    647,695.40/971,543.10 = 423,309.20/x
  3. Step 3: Cross multiply
    647,695.40x = 971,543.10 × 423,309.20
  4. Step 4: Simplify right side
    647,695.40x = 411,263,132,426.52
  5. Step 5: Solve for x
    x = 411,263,132,426.52/647,695.40
  6. Step 6: Final answer
    x = 634,963.80

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.