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Finding the Fourth Proportional to 357.40, 535.20 and 261.28

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Solution

The fourth proportional to 357.40, 535.20 and 261.28 is: 391.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.40 : 535.20 = 261.28 : x
  2. Step 2: Convert to fraction form
    357.40/535.20 = 261.28/x
  3. Step 3: Cross multiply
    357.40x = 535.20 × 261.28
  4. Step 4: Simplify right side
    357.40x = 139,837.06
  5. Step 5: Solve for x
    x = 139,837.06/357.40
  6. Step 6: Final answer
    x = 391.26

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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.