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Finding the Fourth Proportional to 759.78, 1,048.90 and 494.61

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Solution

The fourth proportional to 759.78, 1,048.90 and 494.61 is: 682.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.78 : 1,048.90 = 494.61 : x
  2. Step 2: Convert to fraction form
    759.78/1,048.90 = 494.61/x
  3. Step 3: Cross multiply
    759.78x = 1,048.90 × 494.61
  4. Step 4: Simplify right side
    759.78x = 518,792.19
  5. Step 5: Solve for x
    x = 518,792.19/759.78
  6. Step 6: Final answer
    x = 682.82

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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.