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Finding the Fourth Proportional to 1,192.71, 1,645.67 and 720.69

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Solution

The fourth proportional to 1,192.71, 1,645.67 and 720.69 is: 994.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.71 : 1,645.67 = 720.69 : x
  2. Step 2: Convert to fraction form
    1,192.71/1,645.67 = 720.69/x
  3. Step 3: Cross multiply
    1,192.71x = 1,645.67 × 720.69
  4. Step 4: Simplify right side
    1,192.71x = 1,186,017.91
  5. Step 5: Solve for x
    x = 1,186,017.91/1,192.71
  6. Step 6: Final answer
    x = 994.39

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Half 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.