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Finding the Fourth Proportional to 72,781.58, 100,438.40 and 40,950.52

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Solution

The fourth proportional to 72,781.58, 100,438.40 and 40,950.52 is: 56,511.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,781.58 : 100,438.40 = 40,950.52 : x
  2. Step 2: Convert to fraction form
    72,781.58/100,438.40 = 40,950.52/x
  3. Step 3: Cross multiply
    72,781.58x = 100,438.40 × 40,950.52
  4. Step 4: Simplify right side
    72,781.58x = 4,113,004,707.97
  5. Step 5: Solve for x
    x = 4,113,004,707.97/72,781.58
  6. Step 6: Final answer
    x = 56,511.62

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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.