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Finding the Fourth Proportional to 2,145.42, 2,960.64 and 1,213.92

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Solution

The fourth proportional to 2,145.42, 2,960.64 and 1,213.92 is: 1,675.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.42 : 2,960.64 = 1,213.92 : x
  2. Step 2: Convert to fraction form
    2,145.42/2,960.64 = 1,213.92/x
  3. Step 3: Cross multiply
    2,145.42x = 2,960.64 × 1,213.92
  4. Step 4: Simplify right side
    2,145.42x = 3,593,980.11
  5. Step 5: Solve for x
    x = 3,593,980.11/2,145.42
  6. Step 6: Final answer
    x = 1,675.19

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1.5x scale

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.