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Finding the Fourth Proportional to 647,614.40, 971,421.60 and 411,418.40

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Solution

The fourth proportional to 647,614.40, 971,421.60 and 411,418.40 is: 617,127.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,614.40 : 971,421.60 = 411,418.40 : x
  2. Step 2: Convert to fraction form
    647,614.40/971,421.60 = 411,418.40/x
  3. Step 3: Cross multiply
    647,614.40x = 971,421.60 × 411,418.40
  4. Step 4: Simplify right side
    647,614.40x = 399,660,720,397.44
  5. Step 5: Solve for x
    x = 399,660,720,397.44/647,614.40
  6. Step 6: Final answer
    x = 617,127.60

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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.