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Finding the Fourth Proportional to 91,412.70, 137,119.05 and 77,999.10

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Solution

The fourth proportional to 91,412.70, 137,119.05 and 77,999.10 is: 116,998.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,412.70 : 137,119.05 = 77,999.10 : x
  2. Step 2: Convert to fraction form
    91,412.70/137,119.05 = 77,999.10/x
  3. Step 3: Cross multiply
    91,412.70x = 137,119.05 × 77,999.10
  4. Step 4: Simplify right side
    91,412.70x = 10,695,162,492.86
  5. Step 5: Solve for x
    x = 10,695,162,492.86/91,412.70
  6. Step 6: Final answer
    x = 116,998.65

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Double scale
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Similar ratio
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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.