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Finding the Fourth Proportional to 1,954.21, 2,931.72 and 721.63

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Solution

The fourth proportional to 1,954.21, 2,931.72 and 721.63 is: 1,082.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,954.21 : 2,931.72 = 721.63 : x
  2. Step 2: Convert to fraction form
    1,954.21/2,931.72 = 721.63/x
  3. Step 3: Cross multiply
    1,954.21x = 2,931.72 × 721.63
  4. Step 4: Simplify right side
    1,954.21x = 2,115,602.45
  5. Step 5: Solve for x
    x = 2,115,602.45/1,954.21
  6. Step 6: Final answer
    x = 1,082.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.