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Finding the Fourth Proportional to 722.10, 996.80 and 427.40

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Solution

The fourth proportional to 722.10, 996.80 and 427.40 is: 589.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.10 : 996.80 = 427.40 : x
  2. Step 2: Convert to fraction form
    722.10/996.80 = 427.40/x
  3. Step 3: Cross multiply
    722.10x = 996.80 × 427.40
  4. Step 4: Simplify right side
    722.10x = 426,025.20
  5. Step 5: Solve for x
    x = 426,025.20/722.10
  6. Step 6: Final answer
    x = 589.98

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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.