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Finding the Fourth Proportional to 91,309.98, 136,987.11 and 28,981.02

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Solution

The fourth proportional to 91,309.98, 136,987.11 and 28,981.02 is: 43,478.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,309.98 : 136,987.11 = 28,981.02 : x
  2. Step 2: Convert to fraction form
    91,309.98/136,987.11 = 28,981.02/x
  3. Step 3: Cross multiply
    91,309.98x = 136,987.11 × 28,981.02
  4. Step 4: Simplify right side
    91,309.98x = 3,970,026,174.65
  5. Step 5: Solve for x
    x = 3,970,026,174.65/91,309.98
  6. Step 6: Final answer
    x = 43,478.56

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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.