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Finding the Fourth Proportional to 699.98, 966.14 and 420.22

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Solution

The fourth proportional to 699.98, 966.14 and 420.22 is: 580.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.98 : 966.14 = 420.22 : x
  2. Step 2: Convert to fraction form
    699.98/966.14 = 420.22/x
  3. Step 3: Cross multiply
    699.98x = 966.14 × 420.22
  4. Step 4: Simplify right side
    699.98x = 405,994.40
  5. Step 5: Solve for x
    x = 405,994.40/699.98
  6. Step 6: Final answer
    x = 580.01

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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.