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Finding the Fourth Proportional to 711.22, 980.81 and 564.21

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Solution

The fourth proportional to 711.22, 980.81 and 564.21 is: 778.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.22 : 980.81 = 564.21 : x
  2. Step 2: Convert to fraction form
    711.22/980.81 = 564.21/x
  3. Step 3: Cross multiply
    711.22x = 980.81 × 564.21
  4. Step 4: Simplify right side
    711.22x = 553,382.81
  5. Step 5: Solve for x
    x = 553,382.81/711.22
  6. Step 6: Final answer
    x = 778.08

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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.