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Finding the Fourth Proportional to 956.15, 1,434.21 and 631.44

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Solution

The fourth proportional to 956.15, 1,434.21 and 631.44 is: 947.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.15 : 1,434.21 = 631.44 : x
  2. Step 2: Convert to fraction form
    956.15/1,434.21 = 631.44/x
  3. Step 3: Cross multiply
    956.15x = 1,434.21 × 631.44
  4. Step 4: Simplify right side
    956.15x = 905,610.39
  5. Step 5: Solve for x
    x = 905,610.39/956.15
  6. Step 6: Final answer
    x = 947.15

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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.