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Finding the Fourth Proportional to 2,988.12, 4,480.72 and 907.75

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Solution

The fourth proportional to 2,988.12, 4,480.72 and 907.75 is: 1,361.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,988.12 : 4,480.72 = 907.75 : x
  2. Step 2: Convert to fraction form
    2,988.12/4,480.72 = 907.75/x
  3. Step 3: Cross multiply
    2,988.12x = 4,480.72 × 907.75
  4. Step 4: Simplify right side
    2,988.12x = 4,067,373.58
  5. Step 5: Solve for x
    x = 4,067,373.58/2,988.12
  6. Step 6: Final answer
    x = 1,361.18

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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.