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Finding the Fourth Proportional to 8,605.60, 12,898.80 and 4,909.60

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Solution

The fourth proportional to 8,605.60, 12,898.80 and 4,909.60 is: 7,358.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,605.60 : 12,898.80 = 4,909.60 : x
  2. Step 2: Convert to fraction form
    8,605.60/12,898.80 = 4,909.60/x
  3. Step 3: Cross multiply
    8,605.60x = 12,898.80 × 4,909.60
  4. Step 4: Simplify right side
    8,605.60x = 63,327,948.48
  5. Step 5: Solve for x
    x = 63,327,948.48/8,605.60
  6. Step 6: Final answer
    x = 7,358.92

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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.