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Finding the Fourth Proportional to 10,971, 15,139.98 and 6,555

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Solution

The fourth proportional to 10,971, 15,139.98 and 6,555 is: 9,045.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,971 : 15,139.98 = 6,555 : x
  2. Step 2: Convert to fraction form
    10,971/15,139.98 = 6,555/x
  3. Step 3: Cross multiply
    10,971x = 15,139.98 × 6,555
  4. Step 4: Simplify right side
    10,971x = 99,242,568.90
  5. Step 5: Solve for x
    x = 99,242,568.90/10,971
  6. Step 6: Final answer
    x = 9,045.90

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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.