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Finding the Fourth Proportional to 712.79, 983.60 and 398.01

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Solution

The fourth proportional to 712.79, 983.60 and 398.01 is: 549.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.79 : 983.60 = 398.01 : x
  2. Step 2: Convert to fraction form
    712.79/983.60 = 398.01/x
  3. Step 3: Cross multiply
    712.79x = 983.60 × 398.01
  4. Step 4: Simplify right side
    712.79x = 391,480.65
  5. Step 5: Solve for x
    x = 391,480.65/712.79
  6. Step 6: Final answer
    x = 549.23

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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.