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Finding the Fourth Proportional to 931.34, 1,397.27 and 411.46

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Solution

The fourth proportional to 931.34, 1,397.27 and 411.46 is: 617.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.34 : 1,397.27 = 411.46 : x
  2. Step 2: Convert to fraction form
    931.34/1,397.27 = 411.46/x
  3. Step 3: Cross multiply
    931.34x = 1,397.27 × 411.46
  4. Step 4: Simplify right side
    931.34x = 574,918.25
  5. Step 5: Solve for x
    x = 574,918.25/931.34
  6. Step 6: Final answer
    x = 617.30

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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.