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Finding the Fourth Proportional to 84,878.74, 127,301.70 and 80,663.90

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Solution

The fourth proportional to 84,878.74, 127,301.70 and 80,663.90 is: 120,980.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,878.74 : 127,301.70 = 80,663.90 : x
  2. Step 2: Convert to fraction form
    84,878.74/127,301.70 = 80,663.90/x
  3. Step 3: Cross multiply
    84,878.74x = 127,301.70 × 80,663.90
  4. Step 4: Simplify right side
    84,878.74x = 10,268,651,598.63
  5. Step 5: Solve for x
    x = 10,268,651,598.63/84,878.74
  6. Step 6: Final answer
    x = 120,980.25

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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.