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Finding the Fourth Proportional to 699.36, 1,050.05 and 391.15

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Solution

The fourth proportional to 699.36, 1,050.05 and 391.15 is: 587.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.36 : 1,050.05 = 391.15 : x
  2. Step 2: Convert to fraction form
    699.36/1,050.05 = 391.15/x
  3. Step 3: Cross multiply
    699.36x = 1,050.05 × 391.15
  4. Step 4: Simplify right side
    699.36x = 410,727.06
  5. Step 5: Solve for x
    x = 410,727.06/699.36
  6. Step 6: Final answer
    x = 587.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.