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Finding the Fourth Proportional to 1,242.96, 1,715.04 and 719.16

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Solution

The fourth proportional to 1,242.96, 1,715.04 and 719.16 is: 992.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.96 : 1,715.04 = 719.16 : x
  2. Step 2: Convert to fraction form
    1,242.96/1,715.04 = 719.16/x
  3. Step 3: Cross multiply
    1,242.96x = 1,715.04 × 719.16
  4. Step 4: Simplify right side
    1,242.96x = 1,233,388.17
  5. Step 5: Solve for x
    x = 1,233,388.17/1,242.96
  6. Step 6: Final answer
    x = 992.30

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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.