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Finding the Fourth Proportional to 1,243.45, 1,715.68 and 719.18

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Solution

The fourth proportional to 1,243.45, 1,715.68 and 719.18 is: 992.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.45 : 1,715.68 = 719.18 : x
  2. Step 2: Convert to fraction form
    1,243.45/1,715.68 = 719.18/x
  3. Step 3: Cross multiply
    1,243.45x = 1,715.68 × 719.18
  4. Step 4: Simplify right side
    1,243.45x = 1,233,882.74
  5. Step 5: Solve for x
    x = 1,233,882.74/1,243.45
  6. Step 6: Final answer
    x = 992.31

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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.