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Finding the Fourth Proportional to 1,216.40, 1,823.70 and 669.20

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Solution

The fourth proportional to 1,216.40, 1,823.70 and 669.20 is: 1,003.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.40 : 1,823.70 = 669.20 : x
  2. Step 2: Convert to fraction form
    1,216.40/1,823.70 = 669.20/x
  3. Step 3: Cross multiply
    1,216.40x = 1,823.70 × 669.20
  4. Step 4: Simplify right side
    1,216.40x = 1,220,420.04
  5. Step 5: Solve for x
    x = 1,220,420.04/1,216.40
  6. Step 6: Final answer
    x = 1,003.30

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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.