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Finding the Fourth Proportional to 1,207.50, 1,811.22 and 385.82

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Solution

The fourth proportional to 1,207.50, 1,811.22 and 385.82 is: 578.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.50 : 1,811.22 = 385.82 : x
  2. Step 2: Convert to fraction form
    1,207.50/1,811.22 = 385.82/x
  3. Step 3: Cross multiply
    1,207.50x = 1,811.22 × 385.82
  4. Step 4: Simplify right side
    1,207.50x = 698,804.90
  5. Step 5: Solve for x
    x = 698,804.90/1,207.50
  6. Step 6: Final answer
    x = 578.72

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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.