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Finding the Fourth Proportional to 1,305.44, 1,957.20 and 611.72

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Solution

The fourth proportional to 1,305.44, 1,957.20 and 611.72 is: 917.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.44 : 1,957.20 = 611.72 : x
  2. Step 2: Convert to fraction form
    1,305.44/1,957.20 = 611.72/x
  3. Step 3: Cross multiply
    1,305.44x = 1,957.20 × 611.72
  4. Step 4: Simplify right side
    1,305.44x = 1,197,248.60
  5. Step 5: Solve for x
    x = 1,197,248.60/1,305.44
  6. Step 6: Final answer
    x = 917.13

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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.