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Finding the Fourth Proportional to 2,196.40, 3,294.60 and 657.20

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Solution

The fourth proportional to 2,196.40, 3,294.60 and 657.20 is: 985.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,196.40 : 3,294.60 = 657.20 : x
  2. Step 2: Convert to fraction form
    2,196.40/3,294.60 = 657.20/x
  3. Step 3: Cross multiply
    2,196.40x = 3,294.60 × 657.20
  4. Step 4: Simplify right side
    2,196.40x = 2,165,211.12
  5. Step 5: Solve for x
    x = 2,165,211.12/2,196.40
  6. Step 6: Final answer
    x = 985.80

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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.