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Finding the Fourth Proportional to 711.80, 1,066.62 and 346.49

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Solution

The fourth proportional to 711.80, 1,066.62 and 346.49 is: 519.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.80 : 1,066.62 = 346.49 : x
  2. Step 2: Convert to fraction form
    711.80/1,066.62 = 346.49/x
  3. Step 3: Cross multiply
    711.80x = 1,066.62 × 346.49
  4. Step 4: Simplify right side
    711.80x = 369,573.16
  5. Step 5: Solve for x
    x = 369,573.16/711.80
  6. Step 6: Final answer
    x = 519.21

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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.