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Finding the Fourth Proportional to 554.68, 765.38 and 318.61

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Solution

The fourth proportional to 554.68, 765.38 and 318.61 is: 439.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.68 : 765.38 = 318.61 : x
  2. Step 2: Convert to fraction form
    554.68/765.38 = 318.61/x
  3. Step 3: Cross multiply
    554.68x = 765.38 × 318.61
  4. Step 4: Simplify right side
    554.68x = 243,856.13
  5. Step 5: Solve for x
    x = 243,856.13/554.68
  6. Step 6: Final answer
    x = 439.64

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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.