Home / 20,403.78-28,157.72-11,451.97

Finding the Fourth Proportional to 20,403.78, 28,157.72 and 11,451.97

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Solution

The fourth proportional to 20,403.78, 28,157.72 and 11,451.97 is: 15,804.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.78 : 28,157.72 = 11,451.97 : x
  2. Step 2: Convert to fraction form
    20,403.78/28,157.72 = 11,451.97/x
  3. Step 3: Cross multiply
    20,403.78x = 28,157.72 × 11,451.97
  4. Step 4: Simplify right side
    20,403.78x = 322,461,364.71
  5. Step 5: Solve for x
    x = 322,461,364.71/20,403.78
  6. Step 6: Final answer
    x = 15,804.00

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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.