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Finding the Fourth Proportional to 325.84, 487.80 and 256.72

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Solution

The fourth proportional to 325.84, 487.80 and 256.72 is: 384.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.84 : 487.80 = 256.72 : x
  2. Step 2: Convert to fraction form
    325.84/487.80 = 256.72/x
  3. Step 3: Cross multiply
    325.84x = 487.80 × 256.72
  4. Step 4: Simplify right side
    325.84x = 125,228.02
  5. Step 5: Solve for x
    x = 125,228.02/325.84
  6. Step 6: Final answer
    x = 384.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.