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Finding the Fourth Proportional to 905.79, 1,358.54 and 256.57

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Solution

The fourth proportional to 905.79, 1,358.54 and 256.57 is: 384.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.79 : 1,358.54 = 256.57 : x
  2. Step 2: Convert to fraction form
    905.79/1,358.54 = 256.57/x
  3. Step 3: Cross multiply
    905.79x = 1,358.54 × 256.57
  4. Step 4: Simplify right side
    905.79x = 348,560.61
  5. Step 5: Solve for x
    x = 348,560.61/905.79
  6. Step 6: Final answer
    x = 384.81

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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.