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Finding the Fourth Proportional to 78,061.88, 117,059.96 and 56,869.86

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Solution

The fourth proportional to 78,061.88, 117,059.96 and 56,869.86 is: 85,280.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,061.88 : 117,059.96 = 56,869.86 : x
  2. Step 2: Convert to fraction form
    78,061.88/117,059.96 = 56,869.86/x
  3. Step 3: Cross multiply
    78,061.88x = 117,059.96 × 56,869.86
  4. Step 4: Simplify right side
    78,061.88x = 6,657,183,536.81
  5. Step 5: Solve for x
    x = 6,657,183,536.81/78,061.88
  6. Step 6: Final answer
    x = 85,280.85

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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.