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Finding the Fourth Proportional to 987.98, 1,482.48 and 440.54

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Solution

The fourth proportional to 987.98, 1,482.48 and 440.54 is: 661.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.98 : 1,482.48 = 440.54 : x
  2. Step 2: Convert to fraction form
    987.98/1,482.48 = 440.54/x
  3. Step 3: Cross multiply
    987.98x = 1,482.48 × 440.54
  4. Step 4: Simplify right side
    987.98x = 653,091.74
  5. Step 5: Solve for x
    x = 653,091.74/987.98
  6. Step 6: Final answer
    x = 661.04

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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.