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Finding the Fourth Proportional to 72,695.39, 100,319.10 and 40,430.30

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Solution

The fourth proportional to 72,695.39, 100,319.10 and 40,430.30 is: 55,793.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,695.39 : 100,319.10 = 40,430.30 : x
  2. Step 2: Convert to fraction form
    72,695.39/100,319.10 = 40,430.30/x
  3. Step 3: Cross multiply
    72,695.39x = 100,319.10 × 40,430.30
  4. Step 4: Simplify right side
    72,695.39x = 4,055,931,308.73
  5. Step 5: Solve for x
    x = 4,055,931,308.73/72,695.39
  6. Step 6: Final answer
    x = 55,793.51

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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.