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Finding the Fourth Proportional to 903.28, 1,247.54 and 891.16

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Solution

The fourth proportional to 903.28, 1,247.54 and 891.16 is: 1,230.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.28 : 1,247.54 = 891.16 : x
  2. Step 2: Convert to fraction form
    903.28/1,247.54 = 891.16/x
  3. Step 3: Cross multiply
    903.28x = 1,247.54 × 891.16
  4. Step 4: Simplify right side
    903.28x = 1,111,757.75
  5. Step 5: Solve for x
    x = 1,111,757.75/903.28
  6. Step 6: Final answer
    x = 1,230.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.