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Finding the Fourth Proportional to 438.56, 657.53 and 256.31

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Solution

The fourth proportional to 438.56, 657.53 and 256.31 is: 384.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.56 : 657.53 = 256.31 : x
  2. Step 2: Convert to fraction form
    438.56/657.53 = 256.31/x
  3. Step 3: Cross multiply
    438.56x = 657.53 × 256.31
  4. Step 4: Simplify right side
    438.56x = 168,526.95
  5. Step 5: Solve for x
    x = 168,526.95/438.56
  6. Step 6: Final answer
    x = 384.28

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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.