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Finding the Fourth Proportional to 12,438.47, 17,135.88 and 8,655.12

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Solution

The fourth proportional to 12,438.47, 17,135.88 and 8,655.12 is: 11,923.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,438.47 : 17,135.88 = 8,655.12 : x
  2. Step 2: Convert to fraction form
    12,438.47/17,135.88 = 8,655.12/x
  3. Step 3: Cross multiply
    12,438.47x = 17,135.88 × 8,655.12
  4. Step 4: Simplify right side
    12,438.47x = 148,313,097.71
  5. Step 5: Solve for x
    x = 148,313,097.71/12,438.47
  6. Step 6: Final answer
    x = 11,923.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.