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Finding the Fourth Proportional to 699.66, 965.55 and 389.18

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Solution

The fourth proportional to 699.66, 965.55 and 389.18 is: 537.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.66 : 965.55 = 389.18 : x
  2. Step 2: Convert to fraction form
    699.66/965.55 = 389.18/x
  3. Step 3: Cross multiply
    699.66x = 965.55 × 389.18
  4. Step 4: Simplify right side
    699.66x = 375,772.75
  5. Step 5: Solve for x
    x = 375,772.75/699.66
  6. Step 6: Final answer
    x = 537.08

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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.