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Finding the Fourth Proportional to 78,560.42, 117,859.08 and 25,969.90

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Solution

The fourth proportional to 78,560.42, 117,859.08 and 25,969.90 is: 38,960.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,560.42 : 117,859.08 = 25,969.90 : x
  2. Step 2: Convert to fraction form
    78,560.42/117,859.08 = 25,969.90/x
  3. Step 3: Cross multiply
    78,560.42x = 117,859.08 × 25,969.90
  4. Step 4: Simplify right side
    78,560.42x = 3,060,788,521.69
  5. Step 5: Solve for x
    x = 3,060,788,521.69/78,560.42
  6. Step 6: Final answer
    x = 38,960.95

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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.