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Finding the Fourth Proportional to 959.31, 1,322.55 and 627.21

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Solution

The fourth proportional to 959.31, 1,322.55 and 627.21 is: 864.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.31 : 1,322.55 = 627.21 : x
  2. Step 2: Convert to fraction form
    959.31/1,322.55 = 627.21/x
  3. Step 3: Cross multiply
    959.31x = 1,322.55 × 627.21
  4. Step 4: Simplify right side
    959.31x = 829,516.59
  5. Step 5: Solve for x
    x = 829,516.59/959.31
  6. Step 6: Final answer
    x = 864.70

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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.