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Finding the Fourth Proportional to 1,109.80, 1,527.78 and 980.20

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Solution

The fourth proportional to 1,109.80, 1,527.78 and 980.20 is: 1,349.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.80 : 1,527.78 = 980.20 : x
  2. Step 2: Convert to fraction form
    1,109.80/1,527.78 = 980.20/x
  3. Step 3: Cross multiply
    1,109.80x = 1,527.78 × 980.20
  4. Step 4: Simplify right side
    1,109.80x = 1,497,529.96
  5. Step 5: Solve for x
    x = 1,497,529.96/1,109.80
  6. Step 6: Final answer
    x = 1,349.37

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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.