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Finding the Fourth Proportional to 1,120.76, 1,681.32 and 636.92

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Solution

The fourth proportional to 1,120.76, 1,681.32 and 636.92 is: 955.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.76 : 1,681.32 = 636.92 : x
  2. Step 2: Convert to fraction form
    1,120.76/1,681.32 = 636.92/x
  3. Step 3: Cross multiply
    1,120.76x = 1,681.32 × 636.92
  4. Step 4: Simplify right side
    1,120.76x = 1,070,866.33
  5. Step 5: Solve for x
    x = 1,070,866.33/1,120.76
  6. Step 6: Final answer
    x = 955.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.