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Finding the Fourth Proportional to 982, 1,354.74 and 645.79

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Solution

The fourth proportional to 982, 1,354.74 and 645.79 is: 890.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    982 : 1,354.74 = 645.79 : x
  2. Step 2: Convert to fraction form
    982/1,354.74 = 645.79/x
  3. Step 3: Cross multiply
    982x = 1,354.74 × 645.79
  4. Step 4: Simplify right side
    982x = 874,877.54
  5. Step 5: Solve for x
    x = 874,877.54/982
  6. Step 6: Final answer
    x = 890.91

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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.