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Finding the Fourth Proportional to 504.72, 696.42 and 318.30

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Solution

The fourth proportional to 504.72, 696.42 and 318.30 is: 439.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.72 : 696.42 = 318.30 : x
  2. Step 2: Convert to fraction form
    504.72/696.42 = 318.30/x
  3. Step 3: Cross multiply
    504.72x = 696.42 × 318.30
  4. Step 4: Simplify right side
    504.72x = 221,670.49
  5. Step 5: Solve for x
    x = 221,670.49/504.72
  6. Step 6: Final answer
    x = 439.19

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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.