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Finding the Fourth Proportional to 987.90, 1,363.14 and 568.27

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Solution

The fourth proportional to 987.90, 1,363.14 and 568.27 is: 784.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.90 : 1,363.14 = 568.27 : x
  2. Step 2: Convert to fraction form
    987.90/1,363.14 = 568.27/x
  3. Step 3: Cross multiply
    987.90x = 1,363.14 × 568.27
  4. Step 4: Simplify right side
    987.90x = 774,631.57
  5. Step 5: Solve for x
    x = 774,631.57/987.90
  6. Step 6: Final answer
    x = 784.12

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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.