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Finding the Fourth Proportional to 1,854.45, 2,781.88 and 621.94

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Solution

The fourth proportional to 1,854.45, 2,781.88 and 621.94 is: 932.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,854.45 : 2,781.88 = 621.94 : x
  2. Step 2: Convert to fraction form
    1,854.45/2,781.88 = 621.94/x
  3. Step 3: Cross multiply
    1,854.45x = 2,781.88 × 621.94
  4. Step 4: Simplify right side
    1,854.45x = 1,730,162.45
  5. Step 5: Solve for x
    x = 1,730,162.45/1,854.45
  6. Step 6: Final answer
    x = 932.98

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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.