Home / 20,865.52-28,795-11,434.72

Finding the Fourth Proportional to 20,865.52, 28,795 and 11,434.72

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Solution

The fourth proportional to 20,865.52, 28,795 and 11,434.72 is: 15,780.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.52 : 28,795 = 11,434.72 : x
  2. Step 2: Convert to fraction form
    20,865.52/28,795 = 11,434.72/x
  3. Step 3: Cross multiply
    20,865.52x = 28,795 × 11,434.72
  4. Step 4: Simplify right side
    20,865.52x = 329,262,762.40
  5. Step 5: Solve for x
    x = 329,262,762.40/20,865.52
  6. Step 6: Final answer
    x = 15,780.23

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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.