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Finding the Fourth Proportional to 90,810.64, 136,215.96 and 28,486

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Solution

The fourth proportional to 90,810.64, 136,215.96 and 28,486 is: 42,729

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,810.64 : 136,215.96 = 28,486 : x
  2. Step 2: Convert to fraction form
    90,810.64/136,215.96 = 28,486/x
  3. Step 3: Cross multiply
    90,810.64x = 136,215.96 × 28,486
  4. Step 4: Simplify right side
    90,810.64x = 3,880,247,836.56
  5. Step 5: Solve for x
    x = 3,880,247,836.56/90,810.64
  6. Step 6: Final answer
    x = 42,729

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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.