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Finding the Fourth Proportional to 904.90, 1,247.22 and 639.44

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Solution

The fourth proportional to 904.90, 1,247.22 and 639.44 is: 881.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.90 : 1,247.22 = 639.44 : x
  2. Step 2: Convert to fraction form
    904.90/1,247.22 = 639.44/x
  3. Step 3: Cross multiply
    904.90x = 1,247.22 × 639.44
  4. Step 4: Simplify right side
    904.90x = 797,522.36
  5. Step 5: Solve for x
    x = 797,522.36/904.90
  6. Step 6: Final answer
    x = 881.34

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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.