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Finding the Fourth Proportional to 900.32, 1,239.84 and 769.28

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Solution

The fourth proportional to 900.32, 1,239.84 and 769.28 is: 1,059.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.32 : 1,239.84 = 769.28 : x
  2. Step 2: Convert to fraction form
    900.32/1,239.84 = 769.28/x
  3. Step 3: Cross multiply
    900.32x = 1,239.84 × 769.28
  4. Step 4: Simplify right side
    900.32x = 953,784.12
  5. Step 5: Solve for x
    x = 953,784.12/900.32
  6. Step 6: Final answer
    x = 1,059.38

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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.