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Finding the Fourth Proportional to 1,042.88, 1,438.70 and 623

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Solution

The fourth proportional to 1,042.88, 1,438.70 and 623 is: 859.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.88 : 1,438.70 = 623 : x
  2. Step 2: Convert to fraction form
    1,042.88/1,438.70 = 623/x
  3. Step 3: Cross multiply
    1,042.88x = 1,438.70 × 623
  4. Step 4: Simplify right side
    1,042.88x = 896,310.10
  5. Step 5: Solve for x
    x = 896,310.10/1,042.88
  6. Step 6: Final answer
    x = 859.46

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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.