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Finding the Fourth Proportional to 987.57, 1,363.77 and 693.54

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Solution

The fourth proportional to 987.57, 1,363.77 and 693.54 is: 957.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.57 : 1,363.77 = 693.54 : x
  2. Step 2: Convert to fraction form
    987.57/1,363.77 = 693.54/x
  3. Step 3: Cross multiply
    987.57x = 1,363.77 × 693.54
  4. Step 4: Simplify right side
    987.57x = 945,829.05
  5. Step 5: Solve for x
    x = 945,829.05/987.57
  6. Step 6: Final answer
    x = 957.73

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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.