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Finding the Fourth Proportional to 504.80, 696.52 and 318.20

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Solution

The fourth proportional to 504.80, 696.52 and 318.20 is: 439.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.80 : 696.52 = 318.20 : x
  2. Step 2: Convert to fraction form
    504.80/696.52 = 318.20/x
  3. Step 3: Cross multiply
    504.80x = 696.52 × 318.20
  4. Step 4: Simplify right side
    504.80x = 221,632.66
  5. Step 5: Solve for x
    x = 221,632.66/504.80
  6. Step 6: Final answer
    x = 439.05

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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.