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Finding the Fourth Proportional to 891.08, 1,228.76 and 767.16

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Solution

The fourth proportional to 891.08, 1,228.76 and 767.16 is: 1,057.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.08 : 1,228.76 = 767.16 : x
  2. Step 2: Convert to fraction form
    891.08/1,228.76 = 767.16/x
  3. Step 3: Cross multiply
    891.08x = 1,228.76 × 767.16
  4. Step 4: Simplify right side
    891.08x = 942,655.52
  5. Step 5: Solve for x
    x = 942,655.52/891.08
  6. Step 6: Final answer
    x = 1,057.88

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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.