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Finding the Fourth Proportional to 9,115.80, 13,665.45 and 6,343.80

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Solution

The fourth proportional to 9,115.80, 13,665.45 and 6,343.80 is: 9,509.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,115.80 : 13,665.45 = 6,343.80 : x
  2. Step 2: Convert to fraction form
    9,115.80/13,665.45 = 6,343.80/x
  3. Step 3: Cross multiply
    9,115.80x = 13,665.45 × 6,343.80
  4. Step 4: Simplify right side
    9,115.80x = 86,690,881.71
  5. Step 5: Solve for x
    x = 86,690,881.71/9,115.80
  6. Step 6: Final answer
    x = 9,509.96

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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.