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Finding the Fourth Proportional to 1,431.92, 1,975.76 and 872.01

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Solution

The fourth proportional to 1,431.92, 1,975.76 and 872.01 is: 1,203.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.92 : 1,975.76 = 872.01 : x
  2. Step 2: Convert to fraction form
    1,431.92/1,975.76 = 872.01/x
  3. Step 3: Cross multiply
    1,431.92x = 1,975.76 × 872.01
  4. Step 4: Simplify right side
    1,431.92x = 1,722,878.12
  5. Step 5: Solve for x
    x = 1,722,878.12/1,431.92
  6. Step 6: Final answer
    x = 1,203.20

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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.