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Finding the Fourth Proportional to 84,486.78, 126,754.11 and 42,315.93

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Solution

The fourth proportional to 84,486.78, 126,754.11 and 42,315.93 is: 63,485.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,486.78 : 126,754.11 = 42,315.93 : x
  2. Step 2: Convert to fraction form
    84,486.78/126,754.11 = 42,315.93/x
  3. Step 3: Cross multiply
    84,486.78x = 126,754.11 × 42,315.93
  4. Step 4: Simplify right side
    84,486.78x = 5,363,718,045.97
  5. Step 5: Solve for x
    x = 5,363,718,045.97/84,486.78
  6. Step 6: Final answer
    x = 63,485.89

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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.