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Finding the Fourth Proportional to 91,123.70, 136,685.55 and 81,282.20

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Solution

The fourth proportional to 91,123.70, 136,685.55 and 81,282.20 is: 121,923.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,123.70 : 136,685.55 = 81,282.20 : x
  2. Step 2: Convert to fraction form
    91,123.70/136,685.55 = 81,282.20/x
  3. Step 3: Cross multiply
    91,123.70x = 136,685.55 × 81,282.20
  4. Step 4: Simplify right side
    91,123.70x = 11,110,102,212.21
  5. Step 5: Solve for x
    x = 11,110,102,212.21/91,123.70
  6. Step 6: Final answer
    x = 121,923.30

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1.5x scale

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.