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Finding the Fourth Proportional to 1,180.75, 1,629.84 and 715

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Solution

The fourth proportional to 1,180.75, 1,629.84 and 715 is: 986.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.75 : 1,629.84 = 715 : x
  2. Step 2: Convert to fraction form
    1,180.75/1,629.84 = 715/x
  3. Step 3: Cross multiply
    1,180.75x = 1,629.84 × 715
  4. Step 4: Simplify right side
    1,180.75x = 1,165,335.60
  5. Step 5: Solve for x
    x = 1,165,335.60/1,180.75
  6. Step 6: Final answer
    x = 986.95

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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.