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Finding the Fourth Proportional to 905.45, 1,358.30 and 256.16

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Solution

The fourth proportional to 905.45, 1,358.30 and 256.16 is: 384.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.45 : 1,358.30 = 256.16 : x
  2. Step 2: Convert to fraction form
    905.45/1,358.30 = 256.16/x
  3. Step 3: Cross multiply
    905.45x = 1,358.30 × 256.16
  4. Step 4: Simplify right side
    905.45x = 347,946.16
  5. Step 5: Solve for x
    x = 347,946.16/905.45
  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.