Home / 20,853.78-28,777.89-11,422.32

Finding the Fourth Proportional to 20,853.78, 28,777.89 and 11,422.32

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Solution

The fourth proportional to 20,853.78, 28,777.89 and 11,422.32 is: 15,762.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.78 : 28,777.89 = 11,422.32 : x
  2. Step 2: Convert to fraction form
    20,853.78/28,777.89 = 11,422.32/x
  3. Step 3: Cross multiply
    20,853.78x = 28,777.89 × 11,422.32
  4. Step 4: Simplify right side
    20,853.78x = 328,710,268.50
  5. Step 5: Solve for x
    x = 328,710,268.50/20,853.78
  6. Step 6: Final answer
    x = 15,762.62

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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.