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Finding the Fourth Proportional to 90,787.80, 136,181.70 and 51,421.80

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Solution

The fourth proportional to 90,787.80, 136,181.70 and 51,421.80 is: 77,132.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,787.80 : 136,181.70 = 51,421.80 : x
  2. Step 2: Convert to fraction form
    90,787.80/136,181.70 = 51,421.80/x
  3. Step 3: Cross multiply
    90,787.80x = 136,181.70 × 51,421.80
  4. Step 4: Simplify right side
    90,787.80x = 7,002,708,141.06
  5. Step 5: Solve for x
    x = 7,002,708,141.06/90,787.80
  6. Step 6: Final answer
    x = 77,132.70

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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.