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Finding the Fourth Proportional to 439.02, 657.66 and 256.05

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Solution

The fourth proportional to 439.02, 657.66 and 256.05 is: 383.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.02 : 657.66 = 256.05 : x
  2. Step 2: Convert to fraction form
    439.02/657.66 = 256.05/x
  3. Step 3: Cross multiply
    439.02x = 657.66 × 256.05
  4. Step 4: Simplify right side
    439.02x = 168,393.84
  5. Step 5: Solve for x
    x = 168,393.84/439.02
  6. Step 6: Final answer
    x = 383.57

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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.