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Finding the Fourth Proportional to 754.80, 1,040.65 and 488.77

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Solution

The fourth proportional to 754.80, 1,040.65 and 488.77 is: 673.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.80 : 1,040.65 = 488.77 : x
  2. Step 2: Convert to fraction form
    754.80/1,040.65 = 488.77/x
  3. Step 3: Cross multiply
    754.80x = 1,040.65 × 488.77
  4. Step 4: Simplify right side
    754.80x = 508,636.06
  5. Step 5: Solve for x
    x = 508,636.06/754.80
  6. Step 6: Final answer
    x = 673.87

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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.