Home / 2,145.13-3,219.24-912.88

Finding the Fourth Proportional to 2,145.13, 3,219.24 and 912.88

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Solution

The fourth proportional to 2,145.13, 3,219.24 and 912.88 is: 1,369.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.13 : 3,219.24 = 912.88 : x
  2. Step 2: Convert to fraction form
    2,145.13/3,219.24 = 912.88/x
  3. Step 3: Cross multiply
    2,145.13x = 3,219.24 × 912.88
  4. Step 4: Simplify right side
    2,145.13x = 2,938,779.81
  5. Step 5: Solve for x
    x = 2,938,779.81/2,145.13
  6. Step 6: Final answer
    x = 1,369.98

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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.