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Finding the Fourth Proportional to 720.11, 993.74 and 401.06

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Solution

The fourth proportional to 720.11, 993.74 and 401.06 is: 553.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.11 : 993.74 = 401.06 : x
  2. Step 2: Convert to fraction form
    720.11/993.74 = 401.06/x
  3. Step 3: Cross multiply
    720.11x = 993.74 × 401.06
  4. Step 4: Simplify right side
    720.11x = 398,549.84
  5. Step 5: Solve for x
    x = 398,549.84/720.11
  6. Step 6: Final answer
    x = 553.45

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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.