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Finding the Fourth Proportional to 1,785.67, 2,678.15 and 615.61

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Solution

The fourth proportional to 1,785.67, 2,678.15 and 615.61 is: 923.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.67 : 2,678.15 = 615.61 : x
  2. Step 2: Convert to fraction form
    1,785.67/2,678.15 = 615.61/x
  3. Step 3: Cross multiply
    1,785.67x = 2,678.15 × 615.61
  4. Step 4: Simplify right side
    1,785.67x = 1,648,692.84
  5. Step 5: Solve for x
    x = 1,648,692.84/1,785.67
  6. Step 6: Final answer
    x = 923.29

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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.