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Finding the Fourth Proportional to 78,080.16, 117,236.88 and 76,913.76

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Solution

The fourth proportional to 78,080.16, 117,236.88 and 76,913.76 is: 115,485.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,080.16 : 117,236.88 = 76,913.76 : x
  2. Step 2: Convert to fraction form
    78,080.16/117,236.88 = 76,913.76/x
  3. Step 3: Cross multiply
    78,080.16x = 117,236.88 × 76,913.76
  4. Step 4: Simplify right side
    78,080.16x = 9,017,129,251.47
  5. Step 5: Solve for x
    x = 9,017,129,251.47/78,080.16
  6. Step 6: Final answer
    x = 115,485.54

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1.5x scale

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.