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Finding the Fourth Proportional to 1,280.05, 1,920.18 and 549.45

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Solution

The fourth proportional to 1,280.05, 1,920.18 and 549.45 is: 824.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.05 : 1,920.18 = 549.45 : x
  2. Step 2: Convert to fraction form
    1,280.05/1,920.18 = 549.45/x
  3. Step 3: Cross multiply
    1,280.05x = 1,920.18 × 549.45
  4. Step 4: Simplify right side
    1,280.05x = 1,055,042.90
  5. Step 5: Solve for x
    x = 1,055,042.90/1,280.05
  6. Step 6: Final answer
    x = 824.22

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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.