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Finding the Fourth Proportional to 983.90, 1,357.82 and 541.79

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Solution

The fourth proportional to 983.90, 1,357.82 and 541.79 is: 747.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.90 : 1,357.82 = 541.79 : x
  2. Step 2: Convert to fraction form
    983.90/1,357.82 = 541.79/x
  3. Step 3: Cross multiply
    983.90x = 1,357.82 × 541.79
  4. Step 4: Simplify right side
    983.90x = 735,656.69
  5. Step 5: Solve for x
    x = 735,656.69/983.90
  6. Step 6: Final answer
    x = 747.69

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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.