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Finding the Fourth Proportional to 838.09, 1,257.54 and 578.48

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Solution

The fourth proportional to 838.09, 1,257.54 and 578.48 is: 868.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.09 : 1,257.54 = 578.48 : x
  2. Step 2: Convert to fraction form
    838.09/1,257.54 = 578.48/x
  3. Step 3: Cross multiply
    838.09x = 1,257.54 × 578.48
  4. Step 4: Simplify right side
    838.09x = 727,461.74
  5. Step 5: Solve for x
    x = 727,461.74/838.09
  6. Step 6: Final answer
    x = 868.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.