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Finding the Fourth Proportional to 2,107.21, 3,160.95 and 874.72

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Solution

The fourth proportional to 2,107.21, 3,160.95 and 874.72 is: 1,312.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,107.21 : 3,160.95 = 874.72 : x
  2. Step 2: Convert to fraction form
    2,107.21/3,160.95 = 874.72/x
  3. Step 3: Cross multiply
    2,107.21x = 3,160.95 × 874.72
  4. Step 4: Simplify right side
    2,107.21x = 2,764,938.28
  5. Step 5: Solve for x
    x = 2,764,938.28/2,107.21
  6. Step 6: Final answer
    x = 1,312.13

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1.5x scale

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.