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Finding the Fourth Proportional to 6,139.90, 8,615.30 and 6,139.90

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Solution

The fourth proportional to 6,139.90, 8,615.30 and 6,139.90 is: 8,615.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,139.90 : 8,615.30 = 6,139.90 : x
  2. Step 2: Convert to fraction form
    6,139.90/8,615.30 = 6,139.90/x
  3. Step 3: Cross multiply
    6,139.90x = 8,615.30 × 6,139.90
  4. Step 4: Simplify right side
    6,139.90x = 52,897,080.47
  5. Step 5: Solve for x
    x = 52,897,080.47/6,139.90
  6. Step 6: Final answer
    x = 8,615.30

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.