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Finding the Fourth Proportional to 1,989.91, 2,984.88 and 690.47

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Solution

The fourth proportional to 1,989.91, 2,984.88 and 690.47 is: 1,035.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.91 : 2,984.88 = 690.47 : x
  2. Step 2: Convert to fraction form
    1,989.91/2,984.88 = 690.47/x
  3. Step 3: Cross multiply
    1,989.91x = 2,984.88 × 690.47
  4. Step 4: Simplify right side
    1,989.91x = 2,060,968.95
  5. Step 5: Solve for x
    x = 2,060,968.95/1,989.91
  6. Step 6: Final answer
    x = 1,035.71

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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.