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Finding the Fourth Proportional to 283.08, 390.30 and 257.16

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Solution

The fourth proportional to 283.08, 390.30 and 257.16 is: 354.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.08 : 390.30 = 257.16 : x
  2. Step 2: Convert to fraction form
    283.08/390.30 = 257.16/x
  3. Step 3: Cross multiply
    283.08x = 390.30 × 257.16
  4. Step 4: Simplify right side
    283.08x = 100,369.55
  5. Step 5: Solve for x
    x = 100,369.55/283.08
  6. Step 6: Final answer
    x = 354.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.