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Finding the Fourth Proportional to 100,280.46, 138,390.87 and 57,266.97

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Solution

The fourth proportional to 100,280.46, 138,390.87 and 57,266.97 is: 79,030.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,280.46 : 138,390.87 = 57,266.97 : x
  2. Step 2: Convert to fraction form
    100,280.46/138,390.87 = 57,266.97/x
  3. Step 3: Cross multiply
    100,280.46x = 138,390.87 × 57,266.97
  4. Step 4: Simplify right side
    100,280.46x = 7,925,225,800.56
  5. Step 5: Solve for x
    x = 7,925,225,800.56/100,280.46
  6. Step 6: Final answer
    x = 79,030.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.