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Finding the Fourth Proportional to 611.41, 917.57 and 380.64

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Solution

The fourth proportional to 611.41, 917.57 and 380.64 is: 571.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.41 : 917.57 = 380.64 : x
  2. Step 2: Convert to fraction form
    611.41/917.57 = 380.64/x
  3. Step 3: Cross multiply
    611.41x = 917.57 × 380.64
  4. Step 4: Simplify right side
    611.41x = 349,263.84
  5. Step 5: Solve for x
    x = 349,263.84/611.41
  6. Step 6: Final answer
    x = 571.24

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.