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Finding the Fourth Proportional to 125,081.64, 172,639.44 and 79,749.18

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Solution

The fourth proportional to 125,081.64, 172,639.44 and 79,749.18 is: 110,070.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,081.64 : 172,639.44 = 79,749.18 : x
  2. Step 2: Convert to fraction form
    125,081.64/172,639.44 = 79,749.18/x
  3. Step 3: Cross multiply
    125,081.64x = 172,639.44 × 79,749.18
  4. Step 4: Simplify right side
    125,081.64x = 13,767,853,775.66
  5. Step 5: Solve for x
    x = 13,767,853,775.66/125,081.64
  6. Step 6: Final answer
    x = 110,070.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.