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Finding the Fourth Proportional to 722.58, 997.16 and 427.78

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Solution

The fourth proportional to 722.58, 997.16 and 427.78 is: 590.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.58 : 997.16 = 427.78 : x
  2. Step 2: Convert to fraction form
    722.58/997.16 = 427.78/x
  3. Step 3: Cross multiply
    722.58x = 997.16 × 427.78
  4. Step 4: Simplify right side
    722.58x = 426,565.10
  5. Step 5: Solve for x
    x = 426,565.10/722.58
  6. Step 6: Final answer
    x = 590.34

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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.