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Finding the Fourth Proportional to 980.19, 1,352.55 and 560.40

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Solution

The fourth proportional to 980.19, 1,352.55 and 560.40 is: 773.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.19 : 1,352.55 = 560.40 : x
  2. Step 2: Convert to fraction form
    980.19/1,352.55 = 560.40/x
  3. Step 3: Cross multiply
    980.19x = 1,352.55 × 560.40
  4. Step 4: Simplify right side
    980.19x = 757,969.02
  5. Step 5: Solve for x
    x = 757,969.02/980.19
  6. Step 6: Final answer
    x = 773.29

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Double scale
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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.