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Finding the Fourth Proportional to 1,029.39, 1,420.82 and 636.19

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Solution

The fourth proportional to 1,029.39, 1,420.82 and 636.19 is: 878.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.39 : 1,420.82 = 636.19 : x
  2. Step 2: Convert to fraction form
    1,029.39/1,420.82 = 636.19/x
  3. Step 3: Cross multiply
    1,029.39x = 1,420.82 × 636.19
  4. Step 4: Simplify right side
    1,029.39x = 903,901.19
  5. Step 5: Solve for x
    x = 903,901.19/1,029.39
  6. Step 6: Final answer
    x = 878.10

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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.