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Finding the Fourth Proportional to 318.47, 439.91 and 256.53

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Solution

The fourth proportional to 318.47, 439.91 and 256.53 is: 354.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.47 : 439.91 = 256.53 : x
  2. Step 2: Convert to fraction form
    318.47/439.91 = 256.53/x
  3. Step 3: Cross multiply
    318.47x = 439.91 × 256.53
  4. Step 4: Simplify right side
    318.47x = 112,848.83
  5. Step 5: Solve for x
    x = 112,848.83/318.47
  6. Step 6: Final answer
    x = 354.35

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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.