Home / 128,720.88-193,078.89-39,972.42

Finding the Fourth Proportional to 128,720.88, 193,078.89 and 39,972.42

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Solution

The fourth proportional to 128,720.88, 193,078.89 and 39,972.42 is: 59,957.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720.88 : 193,078.89 = 39,972.42 : x
  2. Step 2: Convert to fraction form
    128,720.88/193,078.89 = 39,972.42/x
  3. Step 3: Cross multiply
    128,720.88x = 193,078.89 × 39,972.42
  4. Step 4: Simplify right side
    128,720.88x = 7,717,830,484.21
  5. Step 5: Solve for x
    x = 7,717,830,484.21/128,720.88
  6. Step 6: Final answer
    x = 59,957.88

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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.