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Finding the Fourth Proportional to 91,243.20, 136,864.80 and 42,091.20

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Solution

The fourth proportional to 91,243.20, 136,864.80 and 42,091.20 is: 63,136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,243.20 : 136,864.80 = 42,091.20 : x
  2. Step 2: Convert to fraction form
    91,243.20/136,864.80 = 42,091.20/x
  3. Step 3: Cross multiply
    91,243.20x = 136,864.80 × 42,091.20
  4. Step 4: Simplify right side
    91,243.20x = 5,760,803,669.76
  5. Step 5: Solve for x
    x = 5,760,803,669.76/91,243.20
  6. Step 6: Final answer
    x = 63,136.80

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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.