Home / 1,217.50-1,821.60-1,214.40

Finding the Fourth Proportional to 1,217.50, 1,821.60 and 1,214.40

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Solution

The fourth proportional to 1,217.50, 1,821.60 and 1,214.40 is: 1,816.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.50 : 1,821.60 = 1,214.40 : x
  2. Step 2: Convert to fraction form
    1,217.50/1,821.60 = 1,214.40/x
  3. Step 3: Cross multiply
    1,217.50x = 1,821.60 × 1,214.40
  4. Step 4: Simplify right side
    1,217.50x = 2,212,151.04
  5. Step 5: Solve for x
    x = 2,212,151.04/1,217.50
  6. Step 6: Final answer
    x = 1,816.96

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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.