Home / 20,856.79-28,782.40-11,296.70

Finding the Fourth Proportional to 20,856.79, 28,782.40 and 11,296.70

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Solution

The fourth proportional to 20,856.79, 28,782.40 and 11,296.70 is: 15,589.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.79 : 28,782.40 = 11,296.70 : x
  2. Step 2: Convert to fraction form
    20,856.79/28,782.40 = 11,296.70/x
  3. Step 3: Cross multiply
    20,856.79x = 28,782.40 × 11,296.70
  4. Step 4: Simplify right side
    20,856.79x = 325,145,994.17
  5. Step 5: Solve for x
    x = 325,145,994.17/20,856.79
  6. Step 6: Final answer
    x = 15,589.46

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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.