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Finding the Fourth Proportional to 712.18, 981.75 and 564.85

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Solution

The fourth proportional to 712.18, 981.75 and 564.85 is: 778.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.18 : 981.75 = 564.85 : x
  2. Step 2: Convert to fraction form
    712.18/981.75 = 564.85/x
  3. Step 3: Cross multiply
    712.18x = 981.75 × 564.85
  4. Step 4: Simplify right side
    712.18x = 554,536.58
  5. Step 5: Solve for x
    x = 554,536.58/712.18
  6. Step 6: Final answer
    x = 778.65

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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.