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Finding the Fourth Proportional to 90,874, 136,315.86 and 28,549.36

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Solution

The fourth proportional to 90,874, 136,315.86 and 28,549.36 is: 42,825.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,874 : 136,315.86 = 28,549.36 : x
  2. Step 2: Convert to fraction form
    90,874/136,315.86 = 28,549.36/x
  3. Step 3: Cross multiply
    90,874x = 136,315.86 × 28,549.36
  4. Step 4: Simplify right side
    90,874x = 3,891,730,560.85
  5. Step 5: Solve for x
    x = 3,891,730,560.85/90,874
  6. Step 6: Final answer
    x = 42,825.57

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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.