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Finding the Fourth Proportional to 78,650.79, 117,870.57 and 38,608.64

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Solution

The fourth proportional to 78,650.79, 117,870.57 and 38,608.64 is: 57,861.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,650.79 : 117,870.57 = 38,608.64 : x
  2. Step 2: Convert to fraction form
    78,650.79/117,870.57 = 38,608.64/x
  3. Step 3: Cross multiply
    78,650.79x = 117,870.57 × 38,608.64
  4. Step 4: Simplify right side
    78,650.79x = 4,550,822,403.72
  5. Step 5: Solve for x
    x = 4,550,822,403.72/78,650.79
  6. Step 6: Final answer
    x = 57,861.11

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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.