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Finding the Fourth Proportional to 78,612.58, 117,860.46 and 70,691.86

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Solution

The fourth proportional to 78,612.58, 117,860.46 and 70,691.86 is: 105,985.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,612.58 : 117,860.46 = 70,691.86 : x
  2. Step 2: Convert to fraction form
    78,612.58/117,860.46 = 70,691.86/x
  3. Step 3: Cross multiply
    78,612.58x = 117,860.46 × 70,691.86
  4. Step 4: Simplify right side
    78,612.58x = 8,331,775,137.86
  5. Step 5: Solve for x
    x = 8,331,775,137.86/78,612.58
  6. Step 6: Final answer
    x = 105,985.27

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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.