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Finding the Fourth Proportional to 647,615.90, 971,423.85 and 411,419.90

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Solution

The fourth proportional to 647,615.90, 971,423.85 and 411,419.90 is: 617,129.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,615.90 : 971,423.85 = 411,419.90 : x
  2. Step 2: Convert to fraction form
    647,615.90/971,423.85 = 411,419.90/x
  3. Step 3: Cross multiply
    647,615.90x = 971,423.85 × 411,419.90
  4. Step 4: Simplify right side
    647,615.90x = 399,663,103,224.62
  5. Step 5: Solve for x
    x = 399,663,103,224.62/647,615.90
  6. Step 6: Final answer
    x = 617,129.85

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Double scale
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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.