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Finding the Fourth Proportional to 78,990.63, 118,380.83 and 38,948.49

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Solution

The fourth proportional to 78,990.63, 118,380.83 and 38,948.49 is: 58,370.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,990.63 : 118,380.83 = 38,948.49 : x
  2. Step 2: Convert to fraction form
    78,990.63/118,380.83 = 38,948.49/x
  3. Step 3: Cross multiply
    78,990.63x = 118,380.83 × 38,948.49
  4. Step 4: Simplify right side
    78,990.63x = 4,610,754,378.70
  5. Step 5: Solve for x
    x = 4,610,754,378.70/78,990.63
  6. Step 6: Final answer
    x = 58,370.90

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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.