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Finding the Fourth Proportional to 905.42, 1,358.13 and 256.15

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Solution

The fourth proportional to 905.42, 1,358.13 and 256.15 is: 384.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.42 : 1,358.13 = 256.15 : x
  2. Step 2: Convert to fraction form
    905.42/1,358.13 = 256.15/x
  3. Step 3: Cross multiply
    905.42x = 1,358.13 × 256.15
  4. Step 4: Simplify right side
    905.42x = 347,891.48
  5. Step 5: Solve for x
    x = 347,891.48/905.42
  6. Step 6: Final answer
    x = 384.23

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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.