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Finding the Fourth Proportional to 869.40, 1,199.86 and 634.12

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Solution

The fourth proportional to 869.40, 1,199.86 and 634.12 is: 875.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.40 : 1,199.86 = 634.12 : x
  2. Step 2: Convert to fraction form
    869.40/1,199.86 = 634.12/x
  3. Step 3: Cross multiply
    869.40x = 1,199.86 × 634.12
  4. Step 4: Simplify right side
    869.40x = 760,855.22
  5. Step 5: Solve for x
    x = 760,855.22/869.40
  6. Step 6: Final answer
    x = 875.15

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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.