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Finding the Fourth Proportional to 692.20, 1,030.19 and 659.80

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Solution

The fourth proportional to 692.20, 1,030.19 and 659.80 is: 981.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.20 : 1,030.19 = 659.80 : x
  2. Step 2: Convert to fraction form
    692.20/1,030.19 = 659.80/x
  3. Step 3: Cross multiply
    692.20x = 1,030.19 × 659.80
  4. Step 4: Simplify right side
    692.20x = 679,719.36
  5. Step 5: Solve for x
    x = 679,719.36/692.20
  6. Step 6: Final answer
    x = 981.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.