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Finding the Fourth Proportional to 987.41, 1,362.50 and 628.38

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Solution

The fourth proportional to 987.41, 1,362.50 and 628.38 is: 867.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.41 : 1,362.50 = 628.38 : x
  2. Step 2: Convert to fraction form
    987.41/1,362.50 = 628.38/x
  3. Step 3: Cross multiply
    987.41x = 1,362.50 × 628.38
  4. Step 4: Simplify right side
    987.41x = 856,164.61
  5. Step 5: Solve for x
    x = 856,164.61/987.41
  6. Step 6: Final answer
    x = 867.09

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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.