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Finding the Fourth Proportional to 1,721.72, 2,375.90 and 975.64

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Solution

The fourth proportional to 1,721.72, 2,375.90 and 975.64 is: 1,346.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.72 : 2,375.90 = 975.64 : x
  2. Step 2: Convert to fraction form
    1,721.72/2,375.90 = 975.64/x
  3. Step 3: Cross multiply
    1,721.72x = 2,375.90 × 975.64
  4. Step 4: Simplify right side
    1,721.72x = 2,318,023.08
  5. Step 5: Solve for x
    x = 2,318,023.08/1,721.72
  6. Step 6: Final answer
    x = 1,346.34

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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.