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Finding the Fourth Proportional to 1,207.23, 1,810.81 and 385.55

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Solution

The fourth proportional to 1,207.23, 1,810.81 and 385.55 is: 578.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.23 : 1,810.81 = 385.55 : x
  2. Step 2: Convert to fraction form
    1,207.23/1,810.81 = 385.55/x
  3. Step 3: Cross multiply
    1,207.23x = 1,810.81 × 385.55
  4. Step 4: Simplify right side
    1,207.23x = 698,155.87
  5. Step 5: Solve for x
    x = 698,155.87/1,207.23
  6. Step 6: Final answer
    x = 578.31

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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.