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Finding the Fourth Proportional to 405.60, 559.62 and 318.12

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Solution

The fourth proportional to 405.60, 559.62 and 318.12 is: 438.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.60 : 559.62 = 318.12 : x
  2. Step 2: Convert to fraction form
    405.60/559.62 = 318.12/x
  3. Step 3: Cross multiply
    405.60x = 559.62 × 318.12
  4. Step 4: Simplify right side
    405.60x = 178,026.31
  5. Step 5: Solve for x
    x = 178,026.31/405.60
  6. Step 6: Final answer
    x = 438.92

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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.