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Finding the Fourth Proportional to 1,207.13, 1,810.87 and 385.13

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Solution

The fourth proportional to 1,207.13, 1,810.87 and 385.13 is: 577.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.13 : 1,810.87 = 385.13 : x
  2. Step 2: Convert to fraction form
    1,207.13/1,810.87 = 385.13/x
  3. Step 3: Cross multiply
    1,207.13x = 1,810.87 × 385.13
  4. Step 4: Simplify right side
    1,207.13x = 697,414.87
  5. Step 5: Solve for x
    x = 697,414.87/1,207.13
  6. Step 6: Final answer
    x = 577.75

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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.