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Finding the Fourth Proportional to 78,877.20, 118,348.20 and 28,981.20

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Solution

The fourth proportional to 78,877.20, 118,348.20 and 28,981.20 is: 43,483.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,877.20 : 118,348.20 = 28,981.20 : x
  2. Step 2: Convert to fraction form
    78,877.20/118,348.20 = 28,981.20/x
  3. Step 3: Cross multiply
    78,877.20x = 118,348.20 × 28,981.20
  4. Step 4: Simplify right side
    78,877.20x = 3,429,872,853.84
  5. Step 5: Solve for x
    x = 3,429,872,853.84/78,877.20
  6. Step 6: Final answer
    x = 43,483.70

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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.