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Finding the Fourth Proportional to 1,143.09, 1,577.48 and 619.13

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Solution

The fourth proportional to 1,143.09, 1,577.48 and 619.13 is: 854.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.09 : 1,577.48 = 619.13 : x
  2. Step 2: Convert to fraction form
    1,143.09/1,577.48 = 619.13/x
  3. Step 3: Cross multiply
    1,143.09x = 1,577.48 × 619.13
  4. Step 4: Simplify right side
    1,143.09x = 976,654.21
  5. Step 5: Solve for x
    x = 976,654.21/1,143.09
  6. Step 6: Final answer
    x = 854.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.