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Finding the Fourth Proportional to 1,223.74, 1,687.98 and 928.36

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Solution

The fourth proportional to 1,223.74, 1,687.98 and 928.36 is: 1,280.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.74 : 1,687.98 = 928.36 : x
  2. Step 2: Convert to fraction form
    1,223.74/1,687.98 = 928.36/x
  3. Step 3: Cross multiply
    1,223.74x = 1,687.98 × 928.36
  4. Step 4: Simplify right side
    1,223.74x = 1,567,053.11
  5. Step 5: Solve for x
    x = 1,567,053.11/1,223.74
  6. Step 6: Final answer
    x = 1,280.54

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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.