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Finding the Fourth Proportional to 987.12, 1,480.56 and 303.12

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Solution

The fourth proportional to 987.12, 1,480.56 and 303.12 is: 454.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.12 : 1,480.56 = 303.12 : x
  2. Step 2: Convert to fraction form
    987.12/1,480.56 = 303.12/x
  3. Step 3: Cross multiply
    987.12x = 1,480.56 × 303.12
  4. Step 4: Simplify right side
    987.12x = 448,787.35
  5. Step 5: Solve for x
    x = 448,787.35/987.12
  6. Step 6: Final answer
    x = 454.64

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1.5x scale

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.