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Finding the Fourth Proportional to 2,620.64, 3,931.52 and 889.28

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Solution

The fourth proportional to 2,620.64, 3,931.52 and 889.28 is: 1,334.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.64 : 3,931.52 = 889.28 : x
  2. Step 2: Convert to fraction form
    2,620.64/3,931.52 = 889.28/x
  3. Step 3: Cross multiply
    2,620.64x = 3,931.52 × 889.28
  4. Step 4: Simplify right side
    2,620.64x = 3,496,222.11
  5. Step 5: Solve for x
    x = 3,496,222.11/2,620.64
  6. Step 6: Final answer
    x = 1,334.11

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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.