Home / 28,086.39-42,129.45-7,309.89

Finding the Fourth Proportional to 28,086.39, 42,129.45 and 7,309.89

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Solution

The fourth proportional to 28,086.39, 42,129.45 and 7,309.89 is: 10,964.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,086.39 : 42,129.45 = 7,309.89 : x
  2. Step 2: Convert to fraction form
    28,086.39/42,129.45 = 7,309.89/x
  3. Step 3: Cross multiply
    28,086.39x = 42,129.45 × 7,309.89
  4. Step 4: Simplify right side
    28,086.39x = 307,961,645.26
  5. Step 5: Solve for x
    x = 307,961,645.26/28,086.39
  6. Step 6: Final answer
    x = 10,964.80

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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.