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Finding the Fourth Proportional to 1,228.88, 1,692.88 and 980.12

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Solution

The fourth proportional to 1,228.88, 1,692.88 and 980.12 is: 1,350.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.88 : 1,692.88 = 980.12 : x
  2. Step 2: Convert to fraction form
    1,228.88/1,692.88 = 980.12/x
  3. Step 3: Cross multiply
    1,228.88x = 1,692.88 × 980.12
  4. Step 4: Simplify right side
    1,228.88x = 1,659,225.55
  5. Step 5: Solve for x
    x = 1,659,225.55/1,228.88
  6. Step 6: Final answer
    x = 1,350.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.