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Finding the Fourth Proportional to 387.12, 533.88 and 256.08

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Solution

The fourth proportional to 387.12, 533.88 and 256.08 is: 353.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.12 : 533.88 = 256.08 : x
  2. Step 2: Convert to fraction form
    387.12/533.88 = 256.08/x
  3. Step 3: Cross multiply
    387.12x = 533.88 × 256.08
  4. Step 4: Simplify right side
    387.12x = 136,715.99
  5. Step 5: Solve for x
    x = 136,715.99/387.12
  6. Step 6: Final answer
    x = 353.16

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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.