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Finding the Fourth Proportional to 711.98, 1,066.80 and 386.36

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Solution

The fourth proportional to 711.98, 1,066.80 and 386.36 is: 578.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.98 : 1,066.80 = 386.36 : x
  2. Step 2: Convert to fraction form
    711.98/1,066.80 = 386.36/x
  3. Step 3: Cross multiply
    711.98x = 1,066.80 × 386.36
  4. Step 4: Simplify right side
    711.98x = 412,168.85
  5. Step 5: Solve for x
    x = 412,168.85/711.98
  6. Step 6: Final answer
    x = 578.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.