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Finding the Fourth Proportional to 78,588.80, 117,614.40 and 47,446.40

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Solution

The fourth proportional to 78,588.80, 117,614.40 and 47,446.40 is: 71,007.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,588.80 : 117,614.40 = 47,446.40 : x
  2. Step 2: Convert to fraction form
    78,588.80/117,614.40 = 47,446.40/x
  3. Step 3: Cross multiply
    78,588.80x = 117,614.40 × 47,446.40
  4. Step 4: Simplify right side
    78,588.80x = 5,580,379,868.16
  5. Step 5: Solve for x
    x = 5,580,379,868.16/78,588.80
  6. Step 6: Final answer
    x = 71,007.32

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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.