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Finding the Fourth Proportional to 647,591.40, 971,387.10 and 411,978.60

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Solution

The fourth proportional to 647,591.40, 971,387.10 and 411,978.60 is: 617,967.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,591.40 : 971,387.10 = 411,978.60 : x
  2. Step 2: Convert to fraction form
    647,591.40/971,387.10 = 411,978.60/x
  3. Step 3: Cross multiply
    647,591.40x = 971,387.10 × 411,978.60
  4. Step 4: Simplify right side
    647,591.40x = 400,190,697,516.06
  5. Step 5: Solve for x
    x = 400,190,697,516.06/647,591.40
  6. Step 6: Final answer
    x = 617,967.90

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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.