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Finding the Fourth Proportional to 91,320.40, 137,002.20 and 28,990.90

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Solution

The fourth proportional to 91,320.40, 137,002.20 and 28,990.90 is: 43,493.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,320.40 : 137,002.20 = 28,990.90 : x
  2. Step 2: Convert to fraction form
    91,320.40/137,002.20 = 28,990.90/x
  3. Step 3: Cross multiply
    91,320.40x = 137,002.20 × 28,990.90
  4. Step 4: Simplify right side
    91,320.40x = 3,971,817,079.98
  5. Step 5: Solve for x
    x = 3,971,817,079.98/91,320.40
  6. Step 6: Final answer
    x = 43,493.21

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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.