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Finding the Fourth Proportional to 621.46, 931.65 and 256.42

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Solution

The fourth proportional to 621.46, 931.65 and 256.42 is: 384.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.46 : 931.65 = 256.42 : x
  2. Step 2: Convert to fraction form
    621.46/931.65 = 256.42/x
  3. Step 3: Cross multiply
    621.46x = 931.65 × 256.42
  4. Step 4: Simplify right side
    621.46x = 238,893.69
  5. Step 5: Solve for x
    x = 238,893.69/621.46
  6. Step 6: Final answer
    x = 384.41

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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.