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Finding the Fourth Proportional to 1,191.92, 1,645.16 and 772.76

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Solution

The fourth proportional to 1,191.92, 1,645.16 and 772.76 is: 1,066.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.92 : 1,645.16 = 772.76 : x
  2. Step 2: Convert to fraction form
    1,191.92/1,645.16 = 772.76/x
  3. Step 3: Cross multiply
    1,191.92x = 1,645.16 × 772.76
  4. Step 4: Simplify right side
    1,191.92x = 1,271,313.84
  5. Step 5: Solve for x
    x = 1,271,313.84/1,191.92
  6. Step 6: Final answer
    x = 1,066.61

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Half scale
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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.