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Finding the Fourth Proportional to 1,170.35, 1,615.07 and 639.22

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Solution

The fourth proportional to 1,170.35, 1,615.07 and 639.22 is: 882.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.35 : 1,615.07 = 639.22 : x
  2. Step 2: Convert to fraction form
    1,170.35/1,615.07 = 639.22/x
  3. Step 3: Cross multiply
    1,170.35x = 1,615.07 × 639.22
  4. Step 4: Simplify right side
    1,170.35x = 1,032,385.05
  5. Step 5: Solve for x
    x = 1,032,385.05/1,170.35
  6. Step 6: Final answer
    x = 882.12

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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.