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Finding the Fourth Proportional to 72,579.48, 108,876.12 and 28,209.66

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Solution

The fourth proportional to 72,579.48, 108,876.12 and 28,209.66 is: 42,317.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,579.48 : 108,876.12 = 28,209.66 : x
  2. Step 2: Convert to fraction form
    72,579.48/108,876.12 = 28,209.66/x
  3. Step 3: Cross multiply
    72,579.48x = 108,876.12 × 28,209.66
  4. Step 4: Simplify right side
    72,579.48x = 3,071,358,327.32
  5. Step 5: Solve for x
    x = 3,071,358,327.32/72,579.48
  6. Step 6: Final answer
    x = 42,317.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.