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Finding the Fourth Proportional to 72,999.69, 109,528.16 and 28,618.85

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Solution

The fourth proportional to 72,999.69, 109,528.16 and 28,618.85 is: 42,939.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,999.69 : 109,528.16 = 28,618.85 : x
  2. Step 2: Convert to fraction form
    72,999.69/109,528.16 = 28,618.85/x
  3. Step 3: Cross multiply
    72,999.69x = 109,528.16 × 28,618.85
  4. Step 4: Simplify right side
    72,999.69x = 3,134,569,291.08
  5. Step 5: Solve for x
    x = 3,134,569,291.08/72,999.69
  6. Step 6: Final answer
    x = 42,939.49

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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.