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Finding the Fourth Proportional to 699, 1,048.62 and 212.10

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Solution

The fourth proportional to 699, 1,048.62 and 212.10 is: 318.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    699 : 1,048.62 = 212.10 : x
  2. Step 2: Convert to fraction form
    699/1,048.62 = 212.10/x
  3. Step 3: Cross multiply
    699x = 1,048.62 × 212.10
  4. Step 4: Simplify right side
    699x = 222,412.30
  5. Step 5: Solve for x
    x = 222,412.30/699
  6. Step 6: Final answer
    x = 318.19

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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.