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Finding the Fourth Proportional to 84,491.94, 126,132.54 and 78,587.04

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Solution

The fourth proportional to 84,491.94, 126,132.54 and 78,587.04 is: 117,317.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,491.94 : 126,132.54 = 78,587.04 : x
  2. Step 2: Convert to fraction form
    84,491.94/126,132.54 = 78,587.04/x
  3. Step 3: Cross multiply
    84,491.94x = 126,132.54 × 78,587.04
  4. Step 4: Simplify right side
    84,491.94x = 9,912,382,966.28
  5. Step 5: Solve for x
    x = 9,912,382,966.28/84,491.94
  6. Step 6: Final answer
    x = 117,317.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.