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Finding the Fourth Proportional to 1,166.21, 1,608.47 and 761.61

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Solution

The fourth proportional to 1,166.21, 1,608.47 and 761.61 is: 1,050.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,166.21 : 1,608.47 = 761.61 : x
  2. Step 2: Convert to fraction form
    1,166.21/1,608.47 = 761.61/x
  3. Step 3: Cross multiply
    1,166.21x = 1,608.47 × 761.61
  4. Step 4: Simplify right side
    1,166.21x = 1,225,023.03
  5. Step 5: Solve for x
    x = 1,225,023.03/1,166.21
  6. Step 6: Final answer
    x = 1,050.44

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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.