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Finding the Fourth Proportional to 8,700.48, 12,989.16 and 7,388.64

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Solution

The fourth proportional to 8,700.48, 12,989.16 and 7,388.64 is: 11,030.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.48 : 12,989.16 = 7,388.64 : x
  2. Step 2: Convert to fraction form
    8,700.48/12,989.16 = 7,388.64/x
  3. Step 3: Cross multiply
    8,700.48x = 12,989.16 × 7,388.64
  4. Step 4: Simplify right side
    8,700.48x = 95,972,227.14
  5. Step 5: Solve for x
    x = 95,972,227.14/8,700.48
  6. Step 6: Final answer
    x = 11,030.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.