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Finding the Fourth Proportional to 1,078.68, 1,488.36 and 636.63

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Solution

The fourth proportional to 1,078.68, 1,488.36 and 636.63 is: 878.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.68 : 1,488.36 = 636.63 : x
  2. Step 2: Convert to fraction form
    1,078.68/1,488.36 = 636.63/x
  3. Step 3: Cross multiply
    1,078.68x = 1,488.36 × 636.63
  4. Step 4: Simplify right side
    1,078.68x = 947,534.63
  5. Step 5: Solve for x
    x = 947,534.63/1,078.68
  6. Step 6: Final answer
    x = 878.42

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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.