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Finding the Fourth Proportional to 1,282.71, 1,923.72 and 405.03

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Solution

The fourth proportional to 1,282.71, 1,923.72 and 405.03 is: 607.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.71 : 1,923.72 = 405.03 : x
  2. Step 2: Convert to fraction form
    1,282.71/1,923.72 = 405.03/x
  3. Step 3: Cross multiply
    1,282.71x = 1,923.72 × 405.03
  4. Step 4: Simplify right side
    1,282.71x = 779,164.31
  5. Step 5: Solve for x
    x = 779,164.31/1,282.71
  6. Step 6: Final answer
    x = 607.44

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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.