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Finding the Fourth Proportional to 1,042.94, 1,439.21 and 570.82

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Solution

The fourth proportional to 1,042.94, 1,439.21 and 570.82 is: 787.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.94 : 1,439.21 = 570.82 : x
  2. Step 2: Convert to fraction form
    1,042.94/1,439.21 = 570.82/x
  3. Step 3: Cross multiply
    1,042.94x = 1,439.21 × 570.82
  4. Step 4: Simplify right side
    1,042.94x = 821,529.85
  5. Step 5: Solve for x
    x = 821,529.85/1,042.94
  6. Step 6: Final answer
    x = 787.71

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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.