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Finding the Fourth Proportional to 611.36, 917.18 and 393.42

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Solution

The fourth proportional to 611.36, 917.18 and 393.42 is: 590.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.36 : 917.18 = 393.42 : x
  2. Step 2: Convert to fraction form
    611.36/917.18 = 393.42/x
  3. Step 3: Cross multiply
    611.36x = 917.18 × 393.42
  4. Step 4: Simplify right side
    611.36x = 360,836.96
  5. Step 5: Solve for x
    x = 360,836.96/611.36
  6. Step 6: Final answer
    x = 590.22

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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.