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Finding the Fourth Proportional to 1,042.74, 1,438.95 and 570.64

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Solution

The fourth proportional to 1,042.74, 1,438.95 and 570.64 is: 787.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.74 : 1,438.95 = 570.64 : x
  2. Step 2: Convert to fraction form
    1,042.74/1,438.95 = 570.64/x
  3. Step 3: Cross multiply
    1,042.74x = 1,438.95 × 570.64
  4. Step 4: Simplify right side
    1,042.74x = 821,120.46
  5. Step 5: Solve for x
    x = 821,120.46/1,042.74
  6. Step 6: Final answer
    x = 787.46

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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.