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Finding the Fourth Proportional to 910.28, 1,353.78 and 900.56

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Solution

The fourth proportional to 910.28, 1,353.78 and 900.56 is: 1,339.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.28 : 1,353.78 = 900.56 : x
  2. Step 2: Convert to fraction form
    910.28/1,353.78 = 900.56/x
  3. Step 3: Cross multiply
    910.28x = 1,353.78 × 900.56
  4. Step 4: Simplify right side
    910.28x = 1,219,160.12
  5. Step 5: Solve for x
    x = 1,219,160.12/910.28
  6. Step 6: Final answer
    x = 1,339.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.