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Finding the Fourth Proportional to 1,059.03, 1,461.11 and 639.22

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Solution

The fourth proportional to 1,059.03, 1,461.11 and 639.22 is: 881.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,059.03 : 1,461.11 = 639.22 : x
  2. Step 2: Convert to fraction form
    1,059.03/1,461.11 = 639.22/x
  3. Step 3: Cross multiply
    1,059.03x = 1,461.11 × 639.22
  4. Step 4: Simplify right side
    1,059.03x = 933,965.63
  5. Step 5: Solve for x
    x = 933,965.63/1,059.03
  6. Step 6: Final answer
    x = 881.91

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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.