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Finding the Fourth Proportional to 438.71, 657.85 and 256.16

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Solution

The fourth proportional to 438.71, 657.85 and 256.16 is: 384.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.71 : 657.85 = 256.16 : x
  2. Step 2: Convert to fraction form
    438.71/657.85 = 256.16/x
  3. Step 3: Cross multiply
    438.71x = 657.85 × 256.16
  4. Step 4: Simplify right side
    438.71x = 168,514.86
  5. Step 5: Solve for x
    x = 168,514.86/438.71
  6. Step 6: Final answer
    x = 384.11

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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.