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Finding the Fourth Proportional to 78,375.60, 117,628.20 and 36,320.40

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Solution

The fourth proportional to 78,375.60, 117,628.20 and 36,320.40 is: 54,510.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,375.60 : 117,628.20 = 36,320.40 : x
  2. Step 2: Convert to fraction form
    78,375.60/117,628.20 = 36,320.40/x
  3. Step 3: Cross multiply
    78,375.60x = 117,628.20 × 36,320.40
  4. Step 4: Simplify right side
    78,375.60x = 4,272,303,275.28
  5. Step 5: Solve for x
    x = 4,272,303,275.28/78,375.60
  6. Step 6: Final answer
    x = 54,510.63

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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.