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Finding the Fourth Proportional to 285.36, 430.26 and 261.36

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Solution

The fourth proportional to 285.36, 430.26 and 261.36 is: 394.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.36 : 430.26 = 261.36 : x
  2. Step 2: Convert to fraction form
    285.36/430.26 = 261.36/x
  3. Step 3: Cross multiply
    285.36x = 430.26 × 261.36
  4. Step 4: Simplify right side
    285.36x = 112,452.75
  5. Step 5: Solve for x
    x = 112,452.75/285.36
  6. Step 6: Final answer
    x = 394.07

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.