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Finding the Fourth Proportional to 927.40, 1,279.75 and 554.55

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Solution

The fourth proportional to 927.40, 1,279.75 and 554.55 is: 765.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.40 : 1,279.75 = 554.55 : x
  2. Step 2: Convert to fraction form
    927.40/1,279.75 = 554.55/x
  3. Step 3: Cross multiply
    927.40x = 1,279.75 × 554.55
  4. Step 4: Simplify right side
    927.40x = 709,680.22
  5. Step 5: Solve for x
    x = 709,680.22/927.40
  6. Step 6: Final answer
    x = 765.24

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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.