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Finding the Fourth Proportional to 385.63, 578.53 and 122.07

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Solution

The fourth proportional to 385.63, 578.53 and 122.07 is: 183.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.63 : 578.53 = 122.07 : x
  2. Step 2: Convert to fraction form
    385.63/578.53 = 122.07/x
  3. Step 3: Cross multiply
    385.63x = 578.53 × 122.07
  4. Step 4: Simplify right side
    385.63x = 70,621.16
  5. Step 5: Solve for x
    x = 70,621.16/385.63
  6. Step 6: Final answer
    x = 183.13

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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.