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Finding the Fourth Proportional to 949.41, 1,311.03 and 815.76

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Solution

The fourth proportional to 949.41, 1,311.03 and 815.76 is: 1,126.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.41 : 1,311.03 = 815.76 : x
  2. Step 2: Convert to fraction form
    949.41/1,311.03 = 815.76/x
  3. Step 3: Cross multiply
    949.41x = 1,311.03 × 815.76
  4. Step 4: Simplify right side
    949.41x = 1,069,485.83
  5. Step 5: Solve for x
    x = 1,069,485.83/949.41
  6. Step 6: Final answer
    x = 1,126.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.