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Finding the Fourth Proportional to 983.91, 1,357.73 and 535.78

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Solution

The fourth proportional to 983.91, 1,357.73 and 535.78 is: 739.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.91 : 1,357.73 = 535.78 : x
  2. Step 2: Convert to fraction form
    983.91/1,357.73 = 535.78/x
  3. Step 3: Cross multiply
    983.91x = 1,357.73 × 535.78
  4. Step 4: Simplify right side
    983.91x = 727,442.52
  5. Step 5: Solve for x
    x = 727,442.52/983.91
  6. Step 6: Final answer
    x = 739.34

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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.