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Finding the Fourth Proportional to 257.50, 383.32 and 245.70

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Solution

The fourth proportional to 257.50, 383.32 and 245.70 is: 365.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.50 : 383.32 = 245.70 : x
  2. Step 2: Convert to fraction form
    257.50/383.32 = 245.70/x
  3. Step 3: Cross multiply
    257.50x = 383.32 × 245.70
  4. Step 4: Simplify right side
    257.50x = 94,181.72
  5. Step 5: Solve for x
    x = 94,181.72/257.50
  6. Step 6: Final answer
    x = 365.75

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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.