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Finding the Fourth Proportional to 1,188.75, 1,640.55 and 664.83

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Solution

The fourth proportional to 1,188.75, 1,640.55 and 664.83 is: 917.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.75 : 1,640.55 = 664.83 : x
  2. Step 2: Convert to fraction form
    1,188.75/1,640.55 = 664.83/x
  3. Step 3: Cross multiply
    1,188.75x = 1,640.55 × 664.83
  4. Step 4: Simplify right side
    1,188.75x = 1,090,686.86
  5. Step 5: Solve for x
    x = 1,090,686.86/1,188.75
  6. Step 6: Final answer
    x = 917.51

Related Problems

Find fourth proportional to 594.38, 820.28 and 332.42
Half scale
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Double scale
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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.