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Finding the Fourth Proportional to 85,649.12, 128,486.02 and 26,489.40

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Solution

The fourth proportional to 85,649.12, 128,486.02 and 26,489.40 is: 39,737.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,649.12 : 128,486.02 = 26,489.40 : x
  2. Step 2: Convert to fraction form
    85,649.12/128,486.02 = 26,489.40/x
  3. Step 3: Cross multiply
    85,649.12x = 128,486.02 × 26,489.40
  4. Step 4: Simplify right side
    85,649.12x = 3,403,517,445.74
  5. Step 5: Solve for x
    x = 3,403,517,445.74/85,649.12
  6. Step 6: Final answer
    x = 39,737.92

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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.