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Finding the Fourth Proportional to 984.82, 1,358.71 and 630.80

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Solution

The fourth proportional to 984.82, 1,358.71 and 630.80 is: 870.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.82 : 1,358.71 = 630.80 : x
  2. Step 2: Convert to fraction form
    984.82/1,358.71 = 630.80/x
  3. Step 3: Cross multiply
    984.82x = 1,358.71 × 630.80
  4. Step 4: Simplify right side
    984.82x = 857,071.11
  5. Step 5: Solve for x
    x = 857,071.11/984.82
  6. Step 6: Final answer
    x = 870.28

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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.