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Finding the Fourth Proportional to 20,970.59, 28,939.95 and 11,411.08

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Solution

The fourth proportional to 20,970.59, 28,939.95 and 11,411.08 is: 15,747.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.59 : 28,939.95 = 11,411.08 : x
  2. Step 2: Convert to fraction form
    20,970.59/28,939.95 = 11,411.08/x
  3. Step 3: Cross multiply
    20,970.59x = 28,939.95 × 11,411.08
  4. Step 4: Simplify right side
    20,970.59x = 330,236,012.30
  5. Step 5: Solve for x
    x = 330,236,012.30/20,970.59
  6. Step 6: Final answer
    x = 15,747.58

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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.