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Finding the Fourth Proportional to 900.55, 1,248.43 and 851.28

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Solution

The fourth proportional to 900.55, 1,248.43 and 851.28 is: 1,180.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.55 : 1,248.43 = 851.28 : x
  2. Step 2: Convert to fraction form
    900.55/1,248.43 = 851.28/x
  3. Step 3: Cross multiply
    900.55x = 1,248.43 × 851.28
  4. Step 4: Simplify right side
    900.55x = 1,062,763.49
  5. Step 5: Solve for x
    x = 1,062,763.49/900.55
  6. Step 6: Final answer
    x = 1,180.13

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.