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Finding the Fourth Proportional to 718.12, 1,071.23 and 630.64

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Solution

The fourth proportional to 718.12, 1,071.23 and 630.64 is: 940.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.12 : 1,071.23 = 630.64 : x
  2. Step 2: Convert to fraction form
    718.12/1,071.23 = 630.64/x
  3. Step 3: Cross multiply
    718.12x = 1,071.23 × 630.64
  4. Step 4: Simplify right side
    718.12x = 675,560.49
  5. Step 5: Solve for x
    x = 675,560.49/718.12
  6. Step 6: Final answer
    x = 940.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.