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Finding the Fourth Proportional to 720.64, 994.89 and 555.31

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Solution

The fourth proportional to 720.64, 994.89 and 555.31 is: 766.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.64 : 994.89 = 555.31 : x
  2. Step 2: Convert to fraction form
    720.64/994.89 = 555.31/x
  3. Step 3: Cross multiply
    720.64x = 994.89 × 555.31
  4. Step 4: Simplify right side
    720.64x = 552,472.37
  5. Step 5: Solve for x
    x = 552,472.37/720.64
  6. Step 6: Final answer
    x = 766.64

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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.