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Finding the Fourth Proportional to 268,987.20, 403,480.80 and 81,998.40

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Solution

The fourth proportional to 268,987.20, 403,480.80 and 81,998.40 is: 122,997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,987.20 : 403,480.80 = 81,998.40 : x
  2. Step 2: Convert to fraction form
    268,987.20/403,480.80 = 81,998.40/x
  3. Step 3: Cross multiply
    268,987.20x = 403,480.80 × 81,998.40
  4. Step 4: Simplify right side
    268,987.20x = 33,084,780,030.72
  5. Step 5: Solve for x
    x = 33,084,780,030.72/268,987.20
  6. Step 6: Final answer
    x = 122,997.60

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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.