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Finding the Fourth Proportional to 987.07, 1,480.41 and 328.84

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Solution

The fourth proportional to 987.07, 1,480.41 and 328.84 is: 493.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.07 : 1,480.41 = 328.84 : x
  2. Step 2: Convert to fraction form
    987.07/1,480.41 = 328.84/x
  3. Step 3: Cross multiply
    987.07x = 1,480.41 × 328.84
  4. Step 4: Simplify right side
    987.07x = 486,818.02
  5. Step 5: Solve for x
    x = 486,818.02/987.07
  6. Step 6: Final answer
    x = 493.20

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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.