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Finding the Fourth Proportional to 1,280.18, 1,920.88 and 761.22

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Solution

The fourth proportional to 1,280.18, 1,920.88 and 761.22 is: 1,142.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.18 : 1,920.88 = 761.22 : x
  2. Step 2: Convert to fraction form
    1,280.18/1,920.88 = 761.22/x
  3. Step 3: Cross multiply
    1,280.18x = 1,920.88 × 761.22
  4. Step 4: Simplify right side
    1,280.18x = 1,462,212.27
  5. Step 5: Solve for x
    x = 1,462,212.27/1,280.18
  6. Step 6: Final answer
    x = 1,142.19

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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.