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Finding the Fourth Proportional to 1,042.68, 1,438.88 and 570.56

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Solution

The fourth proportional to 1,042.68, 1,438.88 and 570.56 is: 787.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.68 : 1,438.88 = 570.56 : x
  2. Step 2: Convert to fraction form
    1,042.68/1,438.88 = 570.56/x
  3. Step 3: Cross multiply
    1,042.68x = 1,438.88 × 570.56
  4. Step 4: Simplify right side
    1,042.68x = 820,972.40
  5. Step 5: Solve for x
    x = 820,972.40/1,042.68
  6. Step 6: Final answer
    x = 787.37

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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.