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Finding the Fourth Proportional to 1,162.05, 1,603.60 and 664.64

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Solution

The fourth proportional to 1,162.05, 1,603.60 and 664.64 is: 917.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.05 : 1,603.60 = 664.64 : x
  2. Step 2: Convert to fraction form
    1,162.05/1,603.60 = 664.64/x
  3. Step 3: Cross multiply
    1,162.05x = 1,603.60 × 664.64
  4. Step 4: Simplify right side
    1,162.05x = 1,065,813.04
  5. Step 5: Solve for x
    x = 1,065,813.04/1,162.05
  6. Step 6: Final answer
    x = 917.19

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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.