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Finding the Fourth Proportional to 987.84, 1,482.12 and 411.12

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Solution

The fourth proportional to 987.84, 1,482.12 and 411.12 is: 616.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.84 : 1,482.12 = 411.12 : x
  2. Step 2: Convert to fraction form
    987.84/1,482.12 = 411.12/x
  3. Step 3: Cross multiply
    987.84x = 1,482.12 × 411.12
  4. Step 4: Simplify right side
    987.84x = 609,329.17
  5. Step 5: Solve for x
    x = 609,329.17/987.84
  6. Step 6: Final answer
    x = 616.83

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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.