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Finding the Fourth Proportional to 1,107.99, 1,529.16 and 666.12

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Solution

The fourth proportional to 1,107.99, 1,529.16 and 666.12 is: 919.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.99 : 1,529.16 = 666.12 : x
  2. Step 2: Convert to fraction form
    1,107.99/1,529.16 = 666.12/x
  3. Step 3: Cross multiply
    1,107.99x = 1,529.16 × 666.12
  4. Step 4: Simplify right side
    1,107.99x = 1,018,604.06
  5. Step 5: Solve for x
    x = 1,018,604.06/1,107.99
  6. Step 6: Final answer
    x = 919.33

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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.