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Finding the Fourth Proportional to 1,321.61, 1,979.73 and 626.17

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Solution

The fourth proportional to 1,321.61, 1,979.73 and 626.17 is: 937.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.61 : 1,979.73 = 626.17 : x
  2. Step 2: Convert to fraction form
    1,321.61/1,979.73 = 626.17/x
  3. Step 3: Cross multiply
    1,321.61x = 1,979.73 × 626.17
  4. Step 4: Simplify right side
    1,321.61x = 1,239,650.92
  5. Step 5: Solve for x
    x = 1,239,650.92/1,321.61
  6. Step 6: Final answer
    x = 937.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.