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Finding the Fourth Proportional to 385.76, 578.74 and 169.40

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Solution

The fourth proportional to 385.76, 578.74 and 169.40 is: 254.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.76 : 578.74 = 169.40 : x
  2. Step 2: Convert to fraction form
    385.76/578.74 = 169.40/x
  3. Step 3: Cross multiply
    385.76x = 578.74 × 169.40
  4. Step 4: Simplify right side
    385.76x = 98,038.56
  5. Step 5: Solve for x
    x = 98,038.56/385.76
  6. Step 6: Final answer
    x = 254.14

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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.