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Finding the Fourth Proportional to 1,143.34, 1,577.76 and 639.22

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Solution

The fourth proportional to 1,143.34, 1,577.76 and 639.22 is: 882.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.34 : 1,577.76 = 639.22 : x
  2. Step 2: Convert to fraction form
    1,143.34/1,577.76 = 639.22/x
  3. Step 3: Cross multiply
    1,143.34x = 1,577.76 × 639.22
  4. Step 4: Simplify right side
    1,143.34x = 1,008,535.75
  5. Step 5: Solve for x
    x = 1,008,535.75/1,143.34
  6. Step 6: Final answer
    x = 882.10

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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.