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Finding the Fourth Proportional to 6,391.60, 9,587.40 and 5,711.20

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Solution

The fourth proportional to 6,391.60, 9,587.40 and 5,711.20 is: 8,566.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.60 : 9,587.40 = 5,711.20 : x
  2. Step 2: Convert to fraction form
    6,391.60/9,587.40 = 5,711.20/x
  3. Step 3: Cross multiply
    6,391.60x = 9,587.40 × 5,711.20
  4. Step 4: Simplify right side
    6,391.60x = 54,755,558.88
  5. Step 5: Solve for x
    x = 54,755,558.88/6,391.60
  6. Step 6: Final answer
    x = 8,566.80

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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.