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Finding the Fourth Proportional to 1,282.30, 1,923.72 and 417.22

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Solution

The fourth proportional to 1,282.30, 1,923.72 and 417.22 is: 625.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.30 : 1,923.72 = 417.22 : x
  2. Step 2: Convert to fraction form
    1,282.30/1,923.72 = 417.22/x
  3. Step 3: Cross multiply
    1,282.30x = 1,923.72 × 417.22
  4. Step 4: Simplify right side
    1,282.30x = 802,608.08
  5. Step 5: Solve for x
    x = 802,608.08/1,282.30
  6. Step 6: Final answer
    x = 625.91

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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.