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Finding the Fourth Proportional to 720.45, 994.23 and 401.45

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Solution

The fourth proportional to 720.45, 994.23 and 401.45 is: 554.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.45 : 994.23 = 401.45 : x
  2. Step 2: Convert to fraction form
    720.45/994.23 = 401.45/x
  3. Step 3: Cross multiply
    720.45x = 994.23 × 401.45
  4. Step 4: Simplify right side
    720.45x = 399,133.63
  5. Step 5: Solve for x
    x = 399,133.63/720.45
  6. Step 6: Final answer
    x = 554.01

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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.