Home / 1,989.18-2,984.40-690.66

Finding the Fourth Proportional to 1,989.18, 2,984.40 and 690.66

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Solution

The fourth proportional to 1,989.18, 2,984.40 and 690.66 is: 1,036.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.18 : 2,984.40 = 690.66 : x
  2. Step 2: Convert to fraction form
    1,989.18/2,984.40 = 690.66/x
  3. Step 3: Cross multiply
    1,989.18x = 2,984.40 × 690.66
  4. Step 4: Simplify right side
    1,989.18x = 2,061,205.70
  5. Step 5: Solve for x
    x = 2,061,205.70/1,989.18
  6. Step 6: Final answer
    x = 1,036.21

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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.