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Finding the Fourth Proportional to 1,920.34, 2,880.78 and 621.55

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Solution

The fourth proportional to 1,920.34, 2,880.78 and 621.55 is: 932.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.34 : 2,880.78 = 621.55 : x
  2. Step 2: Convert to fraction form
    1,920.34/2,880.78 = 621.55/x
  3. Step 3: Cross multiply
    1,920.34x = 2,880.78 × 621.55
  4. Step 4: Simplify right side
    1,920.34x = 1,790,548.81
  5. Step 5: Solve for x
    x = 1,790,548.81/1,920.34
  6. Step 6: Final answer
    x = 932.41

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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.