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Finding the Fourth Proportional to 712.41, 981.91 and 490.97

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Solution

The fourth proportional to 712.41, 981.91 and 490.97 is: 676.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.41 : 981.91 = 490.97 : x
  2. Step 2: Convert to fraction form
    712.41/981.91 = 490.97/x
  3. Step 3: Cross multiply
    712.41x = 981.91 × 490.97
  4. Step 4: Simplify right side
    712.41x = 482,088.35
  5. Step 5: Solve for x
    x = 482,088.35/712.41
  6. Step 6: Final answer
    x = 676.70

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1.5x scale

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.