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Finding the Fourth Proportional to 711.12, 981.35 and 400.62

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Solution

The fourth proportional to 711.12, 981.35 and 400.62 is: 552.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.12 : 981.35 = 400.62 : x
  2. Step 2: Convert to fraction form
    711.12/981.35 = 400.62/x
  3. Step 3: Cross multiply
    711.12x = 981.35 × 400.62
  4. Step 4: Simplify right side
    711.12x = 393,149.44
  5. Step 5: Solve for x
    x = 393,149.44/711.12
  6. Step 6: Final answer
    x = 552.86

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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.