Home / 128,987.40-193,577.10-66,625.80

Finding the Fourth Proportional to 128,987.40, 193,577.10 and 66,625.80

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Solution

The fourth proportional to 128,987.40, 193,577.10 and 66,625.80 is: 99,988.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,987.40 : 193,577.10 = 66,625.80 : x
  2. Step 2: Convert to fraction form
    128,987.40/193,577.10 = 66,625.80/x
  3. Step 3: Cross multiply
    128,987.40x = 193,577.10 × 66,625.80
  4. Step 4: Simplify right side
    128,987.40x = 12,897,229,149.18
  5. Step 5: Solve for x
    x = 12,897,229,149.18/128,987.40
  6. Step 6: Final answer
    x = 99,988.29

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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.