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Finding the Fourth Proportional to 12,459.88, 17,189.22 and 7,489

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Solution

The fourth proportional to 12,459.88, 17,189.22 and 7,489 is: 10,331.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,459.88 : 17,189.22 = 7,489 : x
  2. Step 2: Convert to fraction form
    12,459.88/17,189.22 = 7,489/x
  3. Step 3: Cross multiply
    12,459.88x = 17,189.22 × 7,489
  4. Step 4: Simplify right side
    12,459.88x = 128,730,068.58
  5. Step 5: Solve for x
    x = 128,730,068.58/12,459.88
  6. Step 6: Final answer
    x = 10,331.57

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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.