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Finding the Fourth Proportional to 947.53, 1,422.47 and 818.38

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Solution

The fourth proportional to 947.53, 1,422.47 and 818.38 is: 1,228.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.53 : 1,422.47 = 818.38 : x
  2. Step 2: Convert to fraction form
    947.53/1,422.47 = 818.38/x
  3. Step 3: Cross multiply
    947.53x = 1,422.47 × 818.38
  4. Step 4: Simplify right side
    947.53x = 1,164,121.00
  5. Step 5: Solve for x
    x = 1,164,121.00/947.53
  6. Step 6: Final answer
    x = 1,228.58

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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.