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Finding the Fourth Proportional to 2,115.05, 2,918.50 and 1,170.71

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Solution

The fourth proportional to 2,115.05, 2,918.50 and 1,170.71 is: 1,615.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.05 : 2,918.50 = 1,170.71 : x
  2. Step 2: Convert to fraction form
    2,115.05/2,918.50 = 1,170.71/x
  3. Step 3: Cross multiply
    2,115.05x = 2,918.50 × 1,170.71
  4. Step 4: Simplify right side
    2,115.05x = 3,416,717.14
  5. Step 5: Solve for x
    x = 3,416,717.14/2,115.05
  6. Step 6: Final answer
    x = 1,615.43

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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.