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Finding the Fourth Proportional to 636.68, 870.81 and 626.60

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Solution

The fourth proportional to 636.68, 870.81 and 626.60 is: 857.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.68 : 870.81 = 626.60 : x
  2. Step 2: Convert to fraction form
    636.68/870.81 = 626.60/x
  3. Step 3: Cross multiply
    636.68x = 870.81 × 626.60
  4. Step 4: Simplify right side
    636.68x = 545,649.55
  5. Step 5: Solve for x
    x = 545,649.55/636.68
  6. Step 6: Final answer
    x = 857.02

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.