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Finding the Fourth Proportional to 987.18, 1,480.77 and 303.18

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Solution

The fourth proportional to 987.18, 1,480.77 and 303.18 is: 454.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.18 : 1,480.77 = 303.18 : x
  2. Step 2: Convert to fraction form
    987.18/1,480.77 = 303.18/x
  3. Step 3: Cross multiply
    987.18x = 1,480.77 × 303.18
  4. Step 4: Simplify right side
    987.18x = 448,939.85
  5. Step 5: Solve for x
    x = 448,939.85/987.18
  6. Step 6: Final answer
    x = 454.77

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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.