Home / 821,109.30-1,231,655.40-260,143.80

Finding the Fourth Proportional to 821,109.30, 1,231,655.40 and 260,143.80

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Solution

The fourth proportional to 821,109.30, 1,231,655.40 and 260,143.80 is: 390,212.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,109.30 : 1,231,655.40 = 260,143.80 : x
  2. Step 2: Convert to fraction form
    821,109.30/1,231,655.40 = 260,143.80/x
  3. Step 3: Cross multiply
    821,109.30x = 1,231,655.40 × 260,143.80
  4. Step 4: Simplify right side
    821,109.30x = 320,407,516,046.52
  5. Step 5: Solve for x
    x = 320,407,516,046.52/821,109.30
  6. Step 6: Final answer
    x = 390,212.99

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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.