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Finding the Fourth Proportional to 78,785.60, 118,079.84 and 39,353.72

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Solution

The fourth proportional to 78,785.60, 118,079.84 and 39,353.72 is: 58,981.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,785.60 : 118,079.84 = 39,353.72 : x
  2. Step 2: Convert to fraction form
    78,785.60/118,079.84 = 39,353.72/x
  3. Step 3: Cross multiply
    78,785.60x = 118,079.84 × 39,353.72
  4. Step 4: Simplify right side
    78,785.60x = 4,646,880,173.84
  5. Step 5: Solve for x
    x = 4,646,880,173.84/78,785.60
  6. Step 6: Final answer
    x = 58,981.34

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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.