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Finding the Fourth Proportional to 1,143.07, 1,577.43 and 619.09

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Solution

The fourth proportional to 1,143.07, 1,577.43 and 619.09 is: 854.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.07 : 1,577.43 = 619.09 : x
  2. Step 2: Convert to fraction form
    1,143.07/1,577.43 = 619.09/x
  3. Step 3: Cross multiply
    1,143.07x = 1,577.43 × 619.09
  4. Step 4: Simplify right side
    1,143.07x = 976,571.14
  5. Step 5: Solve for x
    x = 976,571.14/1,143.07
  6. Step 6: Final answer
    x = 854.34

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Half scale
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Double scale
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1.5x scale

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.