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Finding the Fourth Proportional to 1,988.21, 2,981.64 and 689.38

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Solution

The fourth proportional to 1,988.21, 2,981.64 and 689.38 is: 1,033.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.21 : 2,981.64 = 689.38 : x
  2. Step 2: Convert to fraction form
    1,988.21/2,981.64 = 689.38/x
  3. Step 3: Cross multiply
    1,988.21x = 2,981.64 × 689.38
  4. Step 4: Simplify right side
    1,988.21x = 2,055,482.98
  5. Step 5: Solve for x
    x = 2,055,482.98/1,988.21
  6. Step 6: Final answer
    x = 1,033.84

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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.