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Finding the Fourth Proportional to 1,308.70, 1,963.08 and 615.69

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Solution

The fourth proportional to 1,308.70, 1,963.08 and 615.69 is: 923.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.70 : 1,963.08 = 615.69 : x
  2. Step 2: Convert to fraction form
    1,308.70/1,963.08 = 615.69/x
  3. Step 3: Cross multiply
    1,308.70x = 1,963.08 × 615.69
  4. Step 4: Simplify right side
    1,308.70x = 1,208,648.73
  5. Step 5: Solve for x
    x = 1,208,648.73/1,308.70
  6. Step 6: Final answer
    x = 923.55

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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.