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Finding the Fourth Proportional to 757.09, 1,045.79 and 561.61

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Solution

The fourth proportional to 757.09, 1,045.79 and 561.61 is: 775.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.09 : 1,045.79 = 561.61 : x
  2. Step 2: Convert to fraction form
    757.09/1,045.79 = 561.61/x
  3. Step 3: Cross multiply
    757.09x = 1,045.79 × 561.61
  4. Step 4: Simplify right side
    757.09x = 587,326.12
  5. Step 5: Solve for x
    x = 587,326.12/757.09
  6. Step 6: Final answer
    x = 775.77

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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.