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Finding the Fourth Proportional to 719.46, 992.38 and 664.78

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Solution

The fourth proportional to 719.46, 992.38 and 664.78 is: 916.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.46 : 992.38 = 664.78 : x
  2. Step 2: Convert to fraction form
    719.46/992.38 = 664.78/x
  3. Step 3: Cross multiply
    719.46x = 992.38 × 664.78
  4. Step 4: Simplify right side
    719.46x = 659,714.38
  5. Step 5: Solve for x
    x = 659,714.38/719.46
  6. Step 6: Final answer
    x = 916.96

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Double scale
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1.5x scale

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.