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Finding the Fourth Proportional to 815.47, 1,222.77 and 288.12

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Solution

The fourth proportional to 815.47, 1,222.77 and 288.12 is: 432.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.47 : 1,222.77 = 288.12 : x
  2. Step 2: Convert to fraction form
    815.47/1,222.77 = 288.12/x
  3. Step 3: Cross multiply
    815.47x = 1,222.77 × 288.12
  4. Step 4: Simplify right side
    815.47x = 352,301.66
  5. Step 5: Solve for x
    x = 352,301.66/815.47
  6. Step 6: Final answer
    x = 432.02

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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.