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Finding the Fourth Proportional to 1,574.92, 2,172.86 and 911.42

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Solution

The fourth proportional to 1,574.92, 2,172.86 and 911.42 is: 1,257.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574.92 : 2,172.86 = 911.42 : x
  2. Step 2: Convert to fraction form
    1,574.92/2,172.86 = 911.42/x
  3. Step 3: Cross multiply
    1,574.92x = 2,172.86 × 911.42
  4. Step 4: Simplify right side
    1,574.92x = 1,980,388.06
  5. Step 5: Solve for x
    x = 1,980,388.06/1,574.92
  6. Step 6: Final answer
    x = 1,257.45

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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.