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Finding the Fourth Proportional to 1,304.65, 1,957.15 and 426.85

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Solution

The fourth proportional to 1,304.65, 1,957.15 and 426.85 is: 640.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,304.65 : 1,957.15 = 426.85 : x
  2. Step 2: Convert to fraction form
    1,304.65/1,957.15 = 426.85/x
  3. Step 3: Cross multiply
    1,304.65x = 1,957.15 × 426.85
  4. Step 4: Simplify right side
    1,304.65x = 835,409.48
  5. Step 5: Solve for x
    x = 835,409.48/1,304.65
  6. Step 6: Final answer
    x = 640.33

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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.