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Finding the Fourth Proportional to 1,243.20, 1,715.52 and 719.16

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Solution

The fourth proportional to 1,243.20, 1,715.52 and 719.16 is: 992.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.20 : 1,715.52 = 719.16 : x
  2. Step 2: Convert to fraction form
    1,243.20/1,715.52 = 719.16/x
  3. Step 3: Cross multiply
    1,243.20x = 1,715.52 × 719.16
  4. Step 4: Simplify right side
    1,243.20x = 1,233,733.36
  5. Step 5: Solve for x
    x = 1,233,733.36/1,243.20
  6. Step 6: Final answer
    x = 992.39

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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.