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Finding the Fourth Proportional to 783.28, 1,081.44 and 488.96

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Solution

The fourth proportional to 783.28, 1,081.44 and 488.96 is: 675.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.28 : 1,081.44 = 488.96 : x
  2. Step 2: Convert to fraction form
    783.28/1,081.44 = 488.96/x
  3. Step 3: Cross multiply
    783.28x = 1,081.44 × 488.96
  4. Step 4: Simplify right side
    783.28x = 528,780.90
  5. Step 5: Solve for x
    x = 528,780.90/783.28
  6. Step 6: Final answer
    x = 675.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.