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Finding the Fourth Proportional to 1,248.36, 1,722.70 and 709.98

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Solution

The fourth proportional to 1,248.36, 1,722.70 and 709.98 is: 979.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.36 : 1,722.70 = 709.98 : x
  2. Step 2: Convert to fraction form
    1,248.36/1,722.70 = 709.98/x
  3. Step 3: Cross multiply
    1,248.36x = 1,722.70 × 709.98
  4. Step 4: Simplify right side
    1,248.36x = 1,223,082.55
  5. Step 5: Solve for x
    x = 1,223,082.55/1,248.36
  6. Step 6: Final answer
    x = 979.75

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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.