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Finding the Fourth Proportional to 405.94, 560.55 and 318.46

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Solution

The fourth proportional to 405.94, 560.55 and 318.46 is: 439.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.94 : 560.55 = 318.46 : x
  2. Step 2: Convert to fraction form
    405.94/560.55 = 318.46/x
  3. Step 3: Cross multiply
    405.94x = 560.55 × 318.46
  4. Step 4: Simplify right side
    405.94x = 178,512.75
  5. Step 5: Solve for x
    x = 178,512.75/405.94
  6. Step 6: Final answer
    x = 439.75

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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.