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Finding the Fourth Proportional to 72,789.40, 100,445.16 and 40,956.40

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Solution

The fourth proportional to 72,789.40, 100,445.16 and 40,956.40 is: 56,517.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,789.40 : 100,445.16 = 40,956.40 : x
  2. Step 2: Convert to fraction form
    72,789.40/100,445.16 = 40,956.40/x
  3. Step 3: Cross multiply
    72,789.40x = 100,445.16 × 40,956.40
  4. Step 4: Simplify right side
    72,789.40x = 4,113,872,151.02
  5. Step 5: Solve for x
    x = 4,113,872,151.02/72,789.40
  6. Step 6: Final answer
    x = 56,517.46

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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.