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Finding the Fourth Proportional to 91,126.70, 136,690.05 and 81,285.20

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Solution

The fourth proportional to 91,126.70, 136,690.05 and 81,285.20 is: 121,927.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,126.70 : 136,690.05 = 81,285.20 : x
  2. Step 2: Convert to fraction form
    91,126.70/136,690.05 = 81,285.20/x
  3. Step 3: Cross multiply
    91,126.70x = 136,690.05 × 81,285.20
  4. Step 4: Simplify right side
    91,126.70x = 11,110,878,052.26
  5. Step 5: Solve for x
    x = 11,110,878,052.26/91,126.70
  6. Step 6: Final answer
    x = 121,927.80

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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.