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Finding the Fourth Proportional to 1,222.54, 1,687 and 718.35

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Solution

The fourth proportional to 1,222.54, 1,687 and 718.35 is: 991.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.54 : 1,687 = 718.35 : x
  2. Step 2: Convert to fraction form
    1,222.54/1,687 = 718.35/x
  3. Step 3: Cross multiply
    1,222.54x = 1,687 × 718.35
  4. Step 4: Simplify right side
    1,222.54x = 1,211,856.45
  5. Step 5: Solve for x
    x = 1,211,856.45/1,222.54
  6. Step 6: Final answer
    x = 991.26

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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.