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Finding the Fourth Proportional to 1,042.81, 1,438.97 and 623.07

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Solution

The fourth proportional to 1,042.81, 1,438.97 and 623.07 is: 859.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.81 : 1,438.97 = 623.07 : x
  2. Step 2: Convert to fraction form
    1,042.81/1,438.97 = 623.07/x
  3. Step 3: Cross multiply
    1,042.81x = 1,438.97 × 623.07
  4. Step 4: Simplify right side
    1,042.81x = 896,575.92
  5. Step 5: Solve for x
    x = 896,575.92/1,042.81
  6. Step 6: Final answer
    x = 859.77

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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.