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Finding the Fourth Proportional to 1,572.11, 2,169.42 and 908.82

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Solution

The fourth proportional to 1,572.11, 2,169.42 and 908.82 is: 1,254.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.11 : 2,169.42 = 908.82 : x
  2. Step 2: Convert to fraction form
    1,572.11/2,169.42 = 908.82/x
  3. Step 3: Cross multiply
    1,572.11x = 2,169.42 × 908.82
  4. Step 4: Simplify right side
    1,572.11x = 1,971,612.28
  5. Step 5: Solve for x
    x = 1,971,612.28/1,572.11
  6. Step 6: Final answer
    x = 1,254.12

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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.