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Finding the Fourth Proportional to 385.91, 578.86 and 97.35

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Solution

The fourth proportional to 385.91, 578.86 and 97.35 is: 146.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.91 : 578.86 = 97.35 : x
  2. Step 2: Convert to fraction form
    385.91/578.86 = 97.35/x
  3. Step 3: Cross multiply
    385.91x = 578.86 × 97.35
  4. Step 4: Simplify right side
    385.91x = 56,353.41
  5. Step 5: Solve for x
    x = 56,353.41/385.91
  6. Step 6: Final answer
    x = 146.03

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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.