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Finding the Fourth Proportional to 1,785.55, 2,678.78 and 615.58

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Solution

The fourth proportional to 1,785.55, 2,678.78 and 615.58 is: 923.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.55 : 2,678.78 = 615.58 : x
  2. Step 2: Convert to fraction form
    1,785.55/2,678.78 = 615.58/x
  3. Step 3: Cross multiply
    1,785.55x = 2,678.78 × 615.58
  4. Step 4: Simplify right side
    1,785.55x = 1,649,003.39
  5. Step 5: Solve for x
    x = 1,649,003.39/1,785.55
  6. Step 6: Final answer
    x = 923.53

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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.