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Finding the Fourth Proportional to 1,304.40, 1,956.90 and 426.93

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Solution

The fourth proportional to 1,304.40, 1,956.90 and 426.93 is: 640.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,304.40 : 1,956.90 = 426.93 : x
  2. Step 2: Convert to fraction form
    1,304.40/1,956.90 = 426.93/x
  3. Step 3: Cross multiply
    1,304.40x = 1,956.90 × 426.93
  4. Step 4: Simplify right side
    1,304.40x = 835,459.32
  5. Step 5: Solve for x
    x = 835,459.32/1,304.40
  6. Step 6: Final answer
    x = 640.49

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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.