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Finding the Fourth Proportional to 816.01, 1,126.11 and 639.21

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Solution

The fourth proportional to 816.01, 1,126.11 and 639.21 is: 882.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.01 : 1,126.11 = 639.21 : x
  2. Step 2: Convert to fraction form
    816.01/1,126.11 = 639.21/x
  3. Step 3: Cross multiply
    816.01x = 1,126.11 × 639.21
  4. Step 4: Simplify right side
    816.01x = 719,820.77
  5. Step 5: Solve for x
    x = 719,820.77/816.01
  6. Step 6: Final answer
    x = 882.12

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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.