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Finding the Fourth Proportional to 708.05, 1,054.80 and 681.92

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Solution

The fourth proportional to 708.05, 1,054.80 and 681.92 is: 1,015.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.05 : 1,054.80 = 681.92 : x
  2. Step 2: Convert to fraction form
    708.05/1,054.80 = 681.92/x
  3. Step 3: Cross multiply
    708.05x = 1,054.80 × 681.92
  4. Step 4: Simplify right side
    708.05x = 719,283.94
  5. Step 5: Solve for x
    x = 719,283.94/708.05
  6. Step 6: Final answer
    x = 1,015.87

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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.