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Finding the Fourth Proportional to 125,074.86, 172,630.11 and 79,742.40

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Solution

The fourth proportional to 125,074.86, 172,630.11 and 79,742.40 is: 110,061.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,074.86 : 172,630.11 = 79,742.40 : x
  2. Step 2: Convert to fraction form
    125,074.86/172,630.11 = 79,742.40/x
  3. Step 3: Cross multiply
    125,074.86x = 172,630.11 × 79,742.40
  4. Step 4: Simplify right side
    125,074.86x = 13,765,939,283.66
  5. Step 5: Solve for x
    x = 13,765,939,283.66/125,074.86
  6. Step 6: Final answer
    x = 110,061.60

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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.