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Finding the Fourth Proportional to 1,042.82, 1,438.98 and 623.09

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Solution

The fourth proportional to 1,042.82, 1,438.98 and 623.09 is: 859.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.82 : 1,438.98 = 623.09 : x
  2. Step 2: Convert to fraction form
    1,042.82/1,438.98 = 623.09/x
  3. Step 3: Cross multiply
    1,042.82x = 1,438.98 × 623.09
  4. Step 4: Simplify right side
    1,042.82x = 896,612.01
  5. Step 5: Solve for x
    x = 896,612.01/1,042.82
  6. Step 6: Final answer
    x = 859.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.