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Finding the Fourth Proportional to 405.59, 560.12 and 318.11

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Solution

The fourth proportional to 405.59, 560.12 and 318.11 is: 439.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.59 : 560.12 = 318.11 : x
  2. Step 2: Convert to fraction form
    405.59/560.12 = 318.11/x
  3. Step 3: Cross multiply
    405.59x = 560.12 × 318.11
  4. Step 4: Simplify right side
    405.59x = 178,175.38
  5. Step 5: Solve for x
    x = 178,175.38/405.59
  6. Step 6: Final answer
    x = 439.30

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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.