Home / 40,780.96-56,280-30,691.28

Finding the Fourth Proportional to 40,780.96, 56,280 and 30,691.28

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Solution

The fourth proportional to 40,780.96, 56,280 and 30,691.28 is: 42,355.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,780.96 : 56,280 = 30,691.28 : x
  2. Step 2: Convert to fraction form
    40,780.96/56,280 = 30,691.28/x
  3. Step 3: Cross multiply
    40,780.96x = 56,280 × 30,691.28
  4. Step 4: Simplify right side
    40,780.96x = 1,727,305,238.40
  5. Step 5: Solve for x
    x = 1,727,305,238.40/40,780.96
  6. Step 6: Final answer
    x = 42,355.68

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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.