Home / 20,963.76-28,930-12,580.26

Finding the Fourth Proportional to 20,963.76, 28,930 and 12,580.26

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Solution

The fourth proportional to 20,963.76, 28,930 and 12,580.26 is: 17,360.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,963.76 : 28,930 = 12,580.26 : x
  2. Step 2: Convert to fraction form
    20,963.76/28,930 = 12,580.26/x
  3. Step 3: Cross multiply
    20,963.76x = 28,930 × 12,580.26
  4. Step 4: Simplify right side
    20,963.76x = 363,946,921.80
  5. Step 5: Solve for x
    x = 363,946,921.80/20,963.76
  6. Step 6: Final answer
    x = 17,360.77

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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.