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Finding the Fourth Proportional to 1,190.76, 1,643.20 and 666.79

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Solution

The fourth proportional to 1,190.76, 1,643.20 and 666.79 is: 920.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.76 : 1,643.20 = 666.79 : x
  2. Step 2: Convert to fraction form
    1,190.76/1,643.20 = 666.79/x
  3. Step 3: Cross multiply
    1,190.76x = 1,643.20 × 666.79
  4. Step 4: Simplify right side
    1,190.76x = 1,095,669.33
  5. Step 5: Solve for x
    x = 1,095,669.33/1,190.76
  6. Step 6: Final answer
    x = 920.14

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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.