Home / 1,214.28-1,821.60-637.20

Finding the Fourth Proportional to 1,214.28, 1,821.60 and 637.20

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Solution

The fourth proportional to 1,214.28, 1,821.60 and 637.20 is: 955.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.28 : 1,821.60 = 637.20 : x
  2. Step 2: Convert to fraction form
    1,214.28/1,821.60 = 637.20/x
  3. Step 3: Cross multiply
    1,214.28x = 1,821.60 × 637.20
  4. Step 4: Simplify right side
    1,214.28x = 1,160,723.52
  5. Step 5: Solve for x
    x = 1,160,723.52/1,214.28
  6. Step 6: Final answer
    x = 955.89

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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.