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Finding the Fourth Proportional to 1,309.10, 1,963.61 and 615.53

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Solution

The fourth proportional to 1,309.10, 1,963.61 and 615.53 is: 923.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.10 : 1,963.61 = 615.53 : x
  2. Step 2: Convert to fraction form
    1,309.10/1,963.61 = 615.53/x
  3. Step 3: Cross multiply
    1,309.10x = 1,963.61 × 615.53
  4. Step 4: Simplify right side
    1,309.10x = 1,208,665.00
  5. Step 5: Solve for x
    x = 1,208,665.00/1,309.10
  6. Step 6: Final answer
    x = 923.28

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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.