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Finding the Fourth Proportional to 707.31, 1,060.76 and 213.70

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Solution

The fourth proportional to 707.31, 1,060.76 and 213.70 is: 320.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.31 : 1,060.76 = 213.70 : x
  2. Step 2: Convert to fraction form
    707.31/1,060.76 = 213.70/x
  3. Step 3: Cross multiply
    707.31x = 1,060.76 × 213.70
  4. Step 4: Simplify right side
    707.31x = 226,684.41
  5. Step 5: Solve for x
    x = 226,684.41/707.31
  6. Step 6: Final answer
    x = 320.49

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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.