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Finding the Fourth Proportional to 721.50, 996.12 and 555.40

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Solution

The fourth proportional to 721.50, 996.12 and 555.40 is: 766.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.50 : 996.12 = 555.40 : x
  2. Step 2: Convert to fraction form
    721.50/996.12 = 555.40/x
  3. Step 3: Cross multiply
    721.50x = 996.12 × 555.40
  4. Step 4: Simplify right side
    721.50x = 553,242.56
  5. Step 5: Solve for x
    x = 553,242.56/721.50
  6. Step 6: Final answer
    x = 766.79

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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.