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Finding the Fourth Proportional to 754.80, 1,039.64 and 715.92

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Solution

The fourth proportional to 754.80, 1,039.64 and 715.92 is: 986.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.80 : 1,039.64 = 715.92 : x
  2. Step 2: Convert to fraction form
    754.80/1,039.64 = 715.92/x
  3. Step 3: Cross multiply
    754.80x = 1,039.64 × 715.92
  4. Step 4: Simplify right side
    754.80x = 744,299.07
  5. Step 5: Solve for x
    x = 744,299.07/754.80
  6. Step 6: Final answer
    x = 986.09

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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.