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Finding the Fourth Proportional to 403.60, 557.72 and 315.32

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Solution

The fourth proportional to 403.60, 557.72 and 315.32 is: 435.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.60 : 557.72 = 315.32 : x
  2. Step 2: Convert to fraction form
    403.60/557.72 = 315.32/x
  3. Step 3: Cross multiply
    403.60x = 557.72 × 315.32
  4. Step 4: Simplify right side
    403.60x = 175,860.27
  5. Step 5: Solve for x
    x = 175,860.27/403.60
  6. Step 6: Final answer
    x = 435.73

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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.