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Finding the Fourth Proportional to 72,712.56, 100,344.58 and 40,449.75

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Solution

The fourth proportional to 72,712.56, 100,344.58 and 40,449.75 is: 55,821.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,712.56 : 100,344.58 = 40,449.75 : x
  2. Step 2: Convert to fraction form
    72,712.56/100,344.58 = 40,449.75/x
  3. Step 3: Cross multiply
    72,712.56x = 100,344.58 × 40,449.75
  4. Step 4: Simplify right side
    72,712.56x = 4,058,913,174.86
  5. Step 5: Solve for x
    x = 4,058,913,174.86/72,712.56
  6. Step 6: Final answer
    x = 55,821.35

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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.