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Finding the Fourth Proportional to 987.08, 1,476.51 and 694.56

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Solution

The fourth proportional to 987.08, 1,476.51 and 694.56 is: 1,038.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.08 : 1,476.51 = 694.56 : x
  2. Step 2: Convert to fraction form
    987.08/1,476.51 = 694.56/x
  3. Step 3: Cross multiply
    987.08x = 1,476.51 × 694.56
  4. Step 4: Simplify right side
    987.08x = 1,025,524.79
  5. Step 5: Solve for x
    x = 1,025,524.79/987.08
  6. Step 6: Final answer
    x = 1,038.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.