Home / 128,919.12-193,127.40-72,587.04

Finding the Fourth Proportional to 128,919.12, 193,127.40 and 72,587.04

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Solution

The fourth proportional to 128,919.12, 193,127.40 and 72,587.04 is: 108,739.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,919.12 : 193,127.40 = 72,587.04 : x
  2. Step 2: Convert to fraction form
    128,919.12/193,127.40 = 72,587.04/x
  3. Step 3: Cross multiply
    128,919.12x = 193,127.40 × 72,587.04
  4. Step 4: Simplify right side
    128,919.12x = 14,018,546,308.90
  5. Step 5: Solve for x
    x = 14,018,546,308.90/128,919.12
  6. Step 6: Final answer
    x = 108,739.08

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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.