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Finding the Fourth Proportional to 138,602.90, 207,904.35 and 85,841.30

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Solution

The fourth proportional to 138,602.90, 207,904.35 and 85,841.30 is: 128,761.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,602.90 : 207,904.35 = 85,841.30 : x
  2. Step 2: Convert to fraction form
    138,602.90/207,904.35 = 85,841.30/x
  3. Step 3: Cross multiply
    138,602.90x = 207,904.35 × 85,841.30
  4. Step 4: Simplify right side
    138,602.90x = 17,846,779,679.66
  5. Step 5: Solve for x
    x = 17,846,779,679.66/138,602.90
  6. Step 6: Final answer
    x = 128,761.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.