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Finding the Fourth Proportional to 1,109.99, 1,664.99 and 379.58

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Solution

The fourth proportional to 1,109.99, 1,664.99 and 379.58 is: 569.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.99 : 1,664.99 = 379.58 : x
  2. Step 2: Convert to fraction form
    1,109.99/1,664.99 = 379.58/x
  3. Step 3: Cross multiply
    1,109.99x = 1,664.99 × 379.58
  4. Step 4: Simplify right side
    1,109.99x = 631,988.58
  5. Step 5: Solve for x
    x = 631,988.58/1,109.99
  6. Step 6: Final answer
    x = 569.36

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.