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Finding the Fourth Proportional to 315.61, 433.20 and 279.86

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Solution

The fourth proportional to 315.61, 433.20 and 279.86 is: 384.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.61 : 433.20 = 279.86 : x
  2. Step 2: Convert to fraction form
    315.61/433.20 = 279.86/x
  3. Step 3: Cross multiply
    315.61x = 433.20 × 279.86
  4. Step 4: Simplify right side
    315.61x = 121,232.66
  5. Step 5: Solve for x
    x = 121,232.66/315.61
  6. Step 6: Final answer
    x = 384.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.