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Finding the Fourth Proportional to 906.18, 1,358.86 and 256.76

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Solution

The fourth proportional to 906.18, 1,358.86 and 256.76 is: 385.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.18 : 1,358.86 = 256.76 : x
  2. Step 2: Convert to fraction form
    906.18/1,358.86 = 256.76/x
  3. Step 3: Cross multiply
    906.18x = 1,358.86 × 256.76
  4. Step 4: Simplify right side
    906.18x = 348,900.89
  5. Step 5: Solve for x
    x = 348,900.89/906.18
  6. Step 6: Final answer
    x = 385.02

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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.