Home / 20,720.76-28,595.52-11,289.84

Finding the Fourth Proportional to 20,720.76, 28,595.52 and 11,289.84

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Solution

The fourth proportional to 20,720.76, 28,595.52 and 11,289.84 is: 15,580.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.76 : 28,595.52 = 11,289.84 : x
  2. Step 2: Convert to fraction form
    20,720.76/28,595.52 = 11,289.84/x
  3. Step 3: Cross multiply
    20,720.76x = 28,595.52 × 11,289.84
  4. Step 4: Simplify right side
    20,720.76x = 322,838,845.52
  5. Step 5: Solve for x
    x = 322,838,845.52/20,720.76
  6. Step 6: Final answer
    x = 15,580.45

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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.