Home / 20,547.45-28,355.27-11,115.81

Finding the Fourth Proportional to 20,547.45, 28,355.27 and 11,115.81

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Solution

The fourth proportional to 20,547.45, 28,355.27 and 11,115.81 is: 15,339.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,547.45 : 28,355.27 = 11,115.81 : x
  2. Step 2: Convert to fraction form
    20,547.45/28,355.27 = 11,115.81/x
  3. Step 3: Cross multiply
    20,547.45x = 28,355.27 × 11,115.81
  4. Step 4: Simplify right side
    20,547.45x = 315,191,793.82
  5. Step 5: Solve for x
    x = 315,191,793.82/20,547.45
  6. Step 6: Final answer
    x = 15,339.70

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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.