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Finding the Fourth Proportional to 8,561.60, 12,842.40 and 6,615.20

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Solution

The fourth proportional to 8,561.60, 12,842.40 and 6,615.20 is: 9,922.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,561.60 : 12,842.40 = 6,615.20 : x
  2. Step 2: Convert to fraction form
    8,561.60/12,842.40 = 6,615.20/x
  3. Step 3: Cross multiply
    8,561.60x = 12,842.40 × 6,615.20
  4. Step 4: Simplify right side
    8,561.60x = 84,955,044.48
  5. Step 5: Solve for x
    x = 84,955,044.48/8,561.60
  6. Step 6: Final answer
    x = 9,922.80

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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.