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Finding the Fourth Proportional to 711.47, 981.82 and 416.79

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Solution

The fourth proportional to 711.47, 981.82 and 416.79 is: 575.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.47 : 981.82 = 416.79 : x
  2. Step 2: Convert to fraction form
    711.47/981.82 = 416.79/x
  3. Step 3: Cross multiply
    711.47x = 981.82 × 416.79
  4. Step 4: Simplify right side
    711.47x = 409,212.76
  5. Step 5: Solve for x
    x = 409,212.76/711.47
  6. Step 6: Final answer
    x = 575.17

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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.