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Finding the Fourth Proportional to 699.84, 965.28 and 478.44

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Solution

The fourth proportional to 699.84, 965.28 and 478.44 is: 659.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.84 : 965.28 = 478.44 : x
  2. Step 2: Convert to fraction form
    699.84/965.28 = 478.44/x
  3. Step 3: Cross multiply
    699.84x = 965.28 × 478.44
  4. Step 4: Simplify right side
    699.84x = 461,828.56
  5. Step 5: Solve for x
    x = 461,828.56/699.84
  6. Step 6: Final answer
    x = 659.91

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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.