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Finding the Fourth Proportional to 1,042.80, 1,438.82 and 623.29

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Solution

The fourth proportional to 1,042.80, 1,438.82 and 623.29 is: 859.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.80 : 1,438.82 = 623.29 : x
  2. Step 2: Convert to fraction form
    1,042.80/1,438.82 = 623.29/x
  3. Step 3: Cross multiply
    1,042.80x = 1,438.82 × 623.29
  4. Step 4: Simplify right side
    1,042.80x = 896,803.95
  5. Step 5: Solve for x
    x = 896,803.95/1,042.80
  6. Step 6: Final answer
    x = 859.99

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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.