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Finding the Fourth Proportional to 315.45, 474.21 and 178.77

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Solution

The fourth proportional to 315.45, 474.21 and 178.77 is: 268.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.45 : 474.21 = 178.77 : x
  2. Step 2: Convert to fraction form
    315.45/474.21 = 178.77/x
  3. Step 3: Cross multiply
    315.45x = 474.21 × 178.77
  4. Step 4: Simplify right side
    315.45x = 84,774.52
  5. Step 5: Solve for x
    x = 84,774.52/315.45
  6. Step 6: Final answer
    x = 268.74

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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.