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Finding the Fourth Proportional to 305.54, 457.59 and 257.30

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Solution

The fourth proportional to 305.54, 457.59 and 257.30 is: 385.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.54 : 457.59 = 257.30 : x
  2. Step 2: Convert to fraction form
    305.54/457.59 = 257.30/x
  3. Step 3: Cross multiply
    305.54x = 457.59 × 257.30
  4. Step 4: Simplify right side
    305.54x = 117,737.91
  5. Step 5: Solve for x
    x = 117,737.91/305.54
  6. Step 6: Final answer
    x = 385.34

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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.