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Finding the Fourth Proportional to 930.28, 1,399.26 and 815.08

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Solution

The fourth proportional to 930.28, 1,399.26 and 815.08 is: 1,225.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.28 : 1,399.26 = 815.08 : x
  2. Step 2: Convert to fraction form
    930.28/1,399.26 = 815.08/x
  3. Step 3: Cross multiply
    930.28x = 1,399.26 × 815.08
  4. Step 4: Simplify right side
    930.28x = 1,140,508.84
  5. Step 5: Solve for x
    x = 1,140,508.84/930.28
  6. Step 6: Final answer
    x = 1,225.98

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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.