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Finding the Fourth Proportional to 355.40, 533.20 and 253.34

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Solution

The fourth proportional to 355.40, 533.20 and 253.34 is: 380.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.40 : 533.20 = 253.34 : x
  2. Step 2: Convert to fraction form
    355.40/533.20 = 253.34/x
  3. Step 3: Cross multiply
    355.40x = 533.20 × 253.34
  4. Step 4: Simplify right side
    355.40x = 135,080.89
  5. Step 5: Solve for x
    x = 135,080.89/355.40
  6. Step 6: Final answer
    x = 380.08

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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.