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Finding the Fourth Proportional to 330.48, 456.12 and 256.77

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Solution

The fourth proportional to 330.48, 456.12 and 256.77 is: 354.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.48 : 456.12 = 256.77 : x
  2. Step 2: Convert to fraction form
    330.48/456.12 = 256.77/x
  3. Step 3: Cross multiply
    330.48x = 456.12 × 256.77
  4. Step 4: Simplify right side
    330.48x = 117,117.93
  5. Step 5: Solve for x
    x = 117,117.93/330.48
  6. Step 6: Final answer
    x = 354.39

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1.5x scale

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.