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Finding the Fourth Proportional to 128,758.68, 193,175.28 and 53,840.16

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Solution

The fourth proportional to 128,758.68, 193,175.28 and 53,840.16 is: 80,775.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,758.68 : 193,175.28 = 53,840.16 : x
  2. Step 2: Convert to fraction form
    128,758.68/193,175.28 = 53,840.16/x
  3. Step 3: Cross multiply
    128,758.68x = 193,175.28 × 53,840.16
  4. Step 4: Simplify right side
    128,758.68x = 10,400,587,983.24
  5. Step 5: Solve for x
    x = 10,400,587,983.24/128,758.68
  6. Step 6: Final answer
    x = 80,775.82

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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.