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Finding the Fourth Proportional to 839.17, 1,252.72 and 778.35

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Solution

The fourth proportional to 839.17, 1,252.72 and 778.35 is: 1,161.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.17 : 1,252.72 = 778.35 : x
  2. Step 2: Convert to fraction form
    839.17/1,252.72 = 778.35/x
  3. Step 3: Cross multiply
    839.17x = 1,252.72 × 778.35
  4. Step 4: Simplify right side
    839.17x = 975,053.24
  5. Step 5: Solve for x
    x = 975,053.24/839.17
  6. Step 6: Final answer
    x = 1,161.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.