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Finding the Fourth Proportional to 2,140.30, 3,210.54 and 679.42

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Solution

The fourth proportional to 2,140.30, 3,210.54 and 679.42 is: 1,019.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.30 : 3,210.54 = 679.42 : x
  2. Step 2: Convert to fraction form
    2,140.30/3,210.54 = 679.42/x
  3. Step 3: Cross multiply
    2,140.30x = 3,210.54 × 679.42
  4. Step 4: Simplify right side
    2,140.30x = 2,181,297.06
  5. Step 5: Solve for x
    x = 2,181,297.06/2,140.30
  6. Step 6: Final answer
    x = 1,019.16

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1.5x scale

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.