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Finding the Fourth Proportional to 987.94, 1,480.99 and 371.19

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Solution

The fourth proportional to 987.94, 1,480.99 and 371.19 is: 556.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.94 : 1,480.99 = 371.19 : x
  2. Step 2: Convert to fraction form
    987.94/1,480.99 = 371.19/x
  3. Step 3: Cross multiply
    987.94x = 1,480.99 × 371.19
  4. Step 4: Simplify right side
    987.94x = 549,728.68
  5. Step 5: Solve for x
    x = 549,728.68/987.94
  6. Step 6: Final answer
    x = 556.44

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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.