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Finding the Fourth Proportional to 554.68, 765.40 and 318.64

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Solution

The fourth proportional to 554.68, 765.40 and 318.64 is: 439.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.68 : 765.40 = 318.64 : x
  2. Step 2: Convert to fraction form
    554.68/765.40 = 318.64/x
  3. Step 3: Cross multiply
    554.68x = 765.40 × 318.64
  4. Step 4: Simplify right side
    554.68x = 243,887.06
  5. Step 5: Solve for x
    x = 243,887.06/554.68
  6. Step 6: Final answer
    x = 439.69

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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.