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Finding the Fourth Proportional to 78,129.76, 107,819.09 and 42,319.66

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Solution

The fourth proportional to 78,129.76, 107,819.09 and 42,319.66 is: 58,401.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,129.76 : 107,819.09 = 42,319.66 : x
  2. Step 2: Convert to fraction form
    78,129.76/107,819.09 = 42,319.66/x
  3. Step 3: Cross multiply
    78,129.76x = 107,819.09 × 42,319.66
  4. Step 4: Simplify right side
    78,129.76x = 4,562,867,230.31
  5. Step 5: Solve for x
    x = 4,562,867,230.31/78,129.76
  6. Step 6: Final answer
    x = 58,401.14

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1.5x scale

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.