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Finding the Fourth Proportional to 505.02, 697.26 and 318.72

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Solution

The fourth proportional to 505.02, 697.26 and 318.72 is: 440.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.02 : 697.26 = 318.72 : x
  2. Step 2: Convert to fraction form
    505.02/697.26 = 318.72/x
  3. Step 3: Cross multiply
    505.02x = 697.26 × 318.72
  4. Step 4: Simplify right side
    505.02x = 222,230.71
  5. Step 5: Solve for x
    x = 222,230.71/505.02
  6. Step 6: Final answer
    x = 440.04

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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.