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Finding the Fourth Proportional to 1,220.76, 1,828.71 and 988.47

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Solution

The fourth proportional to 1,220.76, 1,828.71 and 988.47 is: 1,480.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.76 : 1,828.71 = 988.47 : x
  2. Step 2: Convert to fraction form
    1,220.76/1,828.71 = 988.47/x
  3. Step 3: Cross multiply
    1,220.76x = 1,828.71 × 988.47
  4. Step 4: Simplify right side
    1,220.76x = 1,807,624.97
  5. Step 5: Solve for x
    x = 1,807,624.97/1,220.76
  6. Step 6: Final answer
    x = 1,480.74

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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.