Home / 1,813.24-2,715.90-1,421.20

Finding the Fourth Proportional to 1,813.24, 2,715.90 and 1,421.20

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Solution

The fourth proportional to 1,813.24, 2,715.90 and 1,421.20 is: 2,128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.24 : 2,715.90 = 1,421.20 : x
  2. Step 2: Convert to fraction form
    1,813.24/2,715.90 = 1,421.20/x
  3. Step 3: Cross multiply
    1,813.24x = 2,715.90 × 1,421.20
  4. Step 4: Simplify right side
    1,813.24x = 3,859,837.08
  5. Step 5: Solve for x
    x = 3,859,837.08/1,813.24
  6. Step 6: Final answer
    x = 2,128.70

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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.