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Finding the Fourth Proportional to 257.56, 383.95 and 253.60

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Solution

The fourth proportional to 257.56, 383.95 and 253.60 is: 378.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.56 : 383.95 = 253.60 : x
  2. Step 2: Convert to fraction form
    257.56/383.95 = 253.60/x
  3. Step 3: Cross multiply
    257.56x = 383.95 × 253.60
  4. Step 4: Simplify right side
    257.56x = 97,369.72
  5. Step 5: Solve for x
    x = 97,369.72/257.56
  6. Step 6: Final answer
    x = 378.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.