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Finding the Fourth Proportional to 711.84, 978.52 and 636.36

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Solution

The fourth proportional to 711.84, 978.52 and 636.36 is: 874.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.84 : 978.52 = 636.36 : x
  2. Step 2: Convert to fraction form
    711.84/978.52 = 636.36/x
  3. Step 3: Cross multiply
    711.84x = 978.52 × 636.36
  4. Step 4: Simplify right side
    711.84x = 622,690.99
  5. Step 5: Solve for x
    x = 622,690.99/711.84
  6. Step 6: Final answer
    x = 874.76

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.