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Finding the Fourth Proportional to 839.78, 1,257.51 and 710.18

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Solution

The fourth proportional to 839.78, 1,257.51 and 710.18 is: 1,063.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.78 : 1,257.51 = 710.18 : x
  2. Step 2: Convert to fraction form
    839.78/1,257.51 = 710.18/x
  3. Step 3: Cross multiply
    839.78x = 1,257.51 × 710.18
  4. Step 4: Simplify right side
    839.78x = 893,058.45
  5. Step 5: Solve for x
    x = 893,058.45/839.78
  6. Step 6: Final answer
    x = 1,063.44

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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.