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Finding the Fourth Proportional to 1,242.80, 1,715.04 and 718.80

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Solution

The fourth proportional to 1,242.80, 1,715.04 and 718.80 is: 991.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.80 : 1,715.04 = 718.80 : x
  2. Step 2: Convert to fraction form
    1,242.80/1,715.04 = 718.80/x
  3. Step 3: Cross multiply
    1,242.80x = 1,715.04 × 718.80
  4. Step 4: Simplify right side
    1,242.80x = 1,232,770.75
  5. Step 5: Solve for x
    x = 1,232,770.75/1,242.80
  6. Step 6: Final answer
    x = 991.93

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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.