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Finding the Fourth Proportional to 1,988.64, 2,983 and 1,172.64

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Solution

The fourth proportional to 1,988.64, 2,983 and 1,172.64 is: 1,758.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.64 : 2,983 = 1,172.64 : x
  2. Step 2: Convert to fraction form
    1,988.64/2,983 = 1,172.64/x
  3. Step 3: Cross multiply
    1,988.64x = 2,983 × 1,172.64
  4. Step 4: Simplify right side
    1,988.64x = 3,497,985.12
  5. Step 5: Solve for x
    x = 3,497,985.12/1,988.64
  6. Step 6: Final answer
    x = 1,758.98

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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.