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Finding the Fourth Proportional to 711.77, 1,066.62 and 315.97

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Solution

The fourth proportional to 711.77, 1,066.62 and 315.97 is: 473.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.77 : 1,066.62 = 315.97 : x
  2. Step 2: Convert to fraction form
    711.77/1,066.62 = 315.97/x
  3. Step 3: Cross multiply
    711.77x = 1,066.62 × 315.97
  4. Step 4: Simplify right side
    711.77x = 337,018.34
  5. Step 5: Solve for x
    x = 337,018.34/711.77
  6. Step 6: Final answer
    x = 473.49

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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.