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Finding the Fourth Proportional to 1,162.28, 1,603.80 and 664.86

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Solution

The fourth proportional to 1,162.28, 1,603.80 and 664.86 is: 917.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.28 : 1,603.80 = 664.86 : x
  2. Step 2: Convert to fraction form
    1,162.28/1,603.80 = 664.86/x
  3. Step 3: Cross multiply
    1,162.28x = 1,603.80 × 664.86
  4. Step 4: Simplify right side
    1,162.28x = 1,066,302.47
  5. Step 5: Solve for x
    x = 1,066,302.47/1,162.28
  6. Step 6: Final answer
    x = 917.42

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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.