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Finding the Fourth Proportional to 1,161.80, 1,603.58 and 664.60

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Solution

The fourth proportional to 1,161.80, 1,603.58 and 664.60 is: 917.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.80 : 1,603.58 = 664.60 : x
  2. Step 2: Convert to fraction form
    1,161.80/1,603.58 = 664.60/x
  3. Step 3: Cross multiply
    1,161.80x = 1,603.58 × 664.60
  4. Step 4: Simplify right side
    1,161.80x = 1,065,737.54
  5. Step 5: Solve for x
    x = 1,065,737.54/1,161.80
  6. Step 6: Final answer
    x = 917.31

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1.5x scale

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.