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Finding the Fourth Proportional to 78,865.20, 118,330.20 and 28,969.20

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Solution

The fourth proportional to 78,865.20, 118,330.20 and 28,969.20 is: 43,465.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,865.20 : 118,330.20 = 28,969.20 : x
  2. Step 2: Convert to fraction form
    78,865.20/118,330.20 = 28,969.20/x
  3. Step 3: Cross multiply
    78,865.20x = 118,330.20 × 28,969.20
  4. Step 4: Simplify right side
    78,865.20x = 3,427,931,229.84
  5. Step 5: Solve for x
    x = 3,427,931,229.84/78,865.20
  6. Step 6: Final answer
    x = 43,465.70

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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.