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Finding the Fourth Proportional to 78,959.16, 108,931.08 and 55,099.68

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Solution

The fourth proportional to 78,959.16, 108,931.08 and 55,099.68 is: 76,014.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,959.16 : 108,931.08 = 55,099.68 : x
  2. Step 2: Convert to fraction form
    78,959.16/108,931.08 = 55,099.68/x
  3. Step 3: Cross multiply
    78,959.16x = 108,931.08 × 55,099.68
  4. Step 4: Simplify right side
    78,959.16x = 6,002,067,650.05
  5. Step 5: Solve for x
    x = 6,002,067,650.05/78,959.16
  6. Step 6: Final answer
    x = 76,014.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.