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Finding the Fourth Proportional to 719.10, 991.31 and 456.66

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Solution

The fourth proportional to 719.10, 991.31 and 456.66 is: 629.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.10 : 991.31 = 456.66 : x
  2. Step 2: Convert to fraction form
    719.10/991.31 = 456.66/x
  3. Step 3: Cross multiply
    719.10x = 991.31 × 456.66
  4. Step 4: Simplify right side
    719.10x = 452,689.34
  5. Step 5: Solve for x
    x = 452,689.34/719.10
  6. Step 6: Final answer
    x = 629.52

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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.