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Finding the Fourth Proportional to 1,220.48, 1,828.80 and 699.20

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Solution

The fourth proportional to 1,220.48, 1,828.80 and 699.20 is: 1,047.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.48 : 1,828.80 = 699.20 : x
  2. Step 2: Convert to fraction form
    1,220.48/1,828.80 = 699.20/x
  3. Step 3: Cross multiply
    1,220.48x = 1,828.80 × 699.20
  4. Step 4: Simplify right side
    1,220.48x = 1,278,696.96
  5. Step 5: Solve for x
    x = 1,278,696.96/1,220.48
  6. Step 6: Final answer
    x = 1,047.70

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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.