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Finding the Fourth Proportional to 987.63, 1,482.02 and 439.87

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Solution

The fourth proportional to 987.63, 1,482.02 and 439.87 is: 660.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.63 : 1,482.02 = 439.87 : x
  2. Step 2: Convert to fraction form
    987.63/1,482.02 = 439.87/x
  3. Step 3: Cross multiply
    987.63x = 1,482.02 × 439.87
  4. Step 4: Simplify right side
    987.63x = 651,896.14
  5. Step 5: Solve for x
    x = 651,896.14/987.63
  6. Step 6: Final answer
    x = 660.06

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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.