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Finding the Fourth Proportional to 983.12, 1,356.66 and 540.95

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Solution

The fourth proportional to 983.12, 1,356.66 and 540.95 is: 746.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.12 : 1,356.66 = 540.95 : x
  2. Step 2: Convert to fraction form
    983.12/1,356.66 = 540.95/x
  3. Step 3: Cross multiply
    983.12x = 1,356.66 × 540.95
  4. Step 4: Simplify right side
    983.12x = 733,888.62
  5. Step 5: Solve for x
    x = 733,888.62/983.12
  6. Step 6: Final answer
    x = 746.49

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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.