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Finding the Fourth Proportional to 78,343.20, 117,514.80 and 75,281.40

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Solution

The fourth proportional to 78,343.20, 117,514.80 and 75,281.40 is: 112,922.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,343.20 : 117,514.80 = 75,281.40 : x
  2. Step 2: Convert to fraction form
    78,343.20/117,514.80 = 75,281.40/x
  3. Step 3: Cross multiply
    78,343.20x = 117,514.80 × 75,281.40
  4. Step 4: Simplify right side
    78,343.20x = 8,846,678,664.72
  5. Step 5: Solve for x
    x = 8,846,678,664.72/78,343.20
  6. Step 6: Final answer
    x = 112,922.10

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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.