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Finding the Fourth Proportional to 783.28, 1,081.56 and 535.12

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Solution

The fourth proportional to 783.28, 1,081.56 and 535.12 is: 738.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.28 : 1,081.56 = 535.12 : x
  2. Step 2: Convert to fraction form
    783.28/1,081.56 = 535.12/x
  3. Step 3: Cross multiply
    783.28x = 1,081.56 × 535.12
  4. Step 4: Simplify right side
    783.28x = 578,764.39
  5. Step 5: Solve for x
    x = 578,764.39/783.28
  6. Step 6: Final answer
    x = 738.90

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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.