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Finding the Fourth Proportional to 2,620.84, 3,931.62 and 889

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Solution

The fourth proportional to 2,620.84, 3,931.62 and 889 is: 1,333.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.84 : 3,931.62 = 889 : x
  2. Step 2: Convert to fraction form
    2,620.84/3,931.62 = 889/x
  3. Step 3: Cross multiply
    2,620.84x = 3,931.62 × 889
  4. Step 4: Simplify right side
    2,620.84x = 3,495,210.18
  5. Step 5: Solve for x
    x = 3,495,210.18/2,620.84
  6. Step 6: Final answer
    x = 1,333.62

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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.