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Finding the Fourth Proportional to 91,079.40, 136,619.10 and 31,908.90

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Solution

The fourth proportional to 91,079.40, 136,619.10 and 31,908.90 is: 47,863.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,079.40 : 136,619.10 = 31,908.90 : x
  2. Step 2: Convert to fraction form
    91,079.40/136,619.10 = 31,908.90/x
  3. Step 3: Cross multiply
    91,079.40x = 136,619.10 × 31,908.90
  4. Step 4: Simplify right side
    91,079.40x = 4,359,365,199.99
  5. Step 5: Solve for x
    x = 4,359,365,199.99/91,079.40
  6. Step 6: Final answer
    x = 47,863.35

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Similar ratio
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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.