Home / 20,990.79-28,967.66-11,430.96

Finding the Fourth Proportional to 20,990.79, 28,967.66 and 11,430.96

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Solution

The fourth proportional to 20,990.79, 28,967.66 and 11,430.96 is: 15,774.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.79 : 28,967.66 = 11,430.96 : x
  2. Step 2: Convert to fraction form
    20,990.79/28,967.66 = 11,430.96/x
  3. Step 3: Cross multiply
    20,990.79x = 28,967.66 × 11,430.96
  4. Step 4: Simplify right side
    20,990.79x = 331,128,162.75
  5. Step 5: Solve for x
    x = 331,128,162.75/20,990.79
  6. Step 6: Final answer
    x = 15,774.93

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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.