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Finding the Fourth Proportional to 711.19, 980.38 and 561.56

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Solution

The fourth proportional to 711.19, 980.38 and 561.56 is: 774.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.19 : 980.38 = 561.56 : x
  2. Step 2: Convert to fraction form
    711.19/980.38 = 561.56/x
  3. Step 3: Cross multiply
    711.19x = 980.38 × 561.56
  4. Step 4: Simplify right side
    711.19x = 550,542.19
  5. Step 5: Solve for x
    x = 550,542.19/711.19
  6. Step 6: Final answer
    x = 774.11

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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.