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Finding the Fourth Proportional to 1,920.36, 2,652.36 and 1,398.72

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Solution

The fourth proportional to 1,920.36, 2,652.36 and 1,398.72 is: 1,931.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.36 : 2,652.36 = 1,398.72 : x
  2. Step 2: Convert to fraction form
    1,920.36/2,652.36 = 1,398.72/x
  3. Step 3: Cross multiply
    1,920.36x = 2,652.36 × 1,398.72
  4. Step 4: Simplify right side
    1,920.36x = 3,709,908.98
  5. Step 5: Solve for x
    x = 3,709,908.98/1,920.36
  6. Step 6: Final answer
    x = 1,931.88

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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.