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Finding the Fourth Proportional to 78,843.40, 117,689.46 and 68,387.12

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Solution

The fourth proportional to 78,843.40, 117,689.46 and 68,387.12 is: 102,081.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,843.40 : 117,689.46 = 68,387.12 : x
  2. Step 2: Convert to fraction form
    78,843.40/117,689.46 = 68,387.12/x
  3. Step 3: Cross multiply
    78,843.40x = 117,689.46 × 68,387.12
  4. Step 4: Simplify right side
    78,843.40x = 8,048,443,223.76
  5. Step 5: Solve for x
    x = 8,048,443,223.76/78,843.40
  6. Step 6: Final answer
    x = 102,081.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.