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Finding the Fourth Proportional to 20,805, 28,710.78 and 11,373.60

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Solution

The fourth proportional to 20,805, 28,710.78 and 11,373.60 is: 15,695.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805 : 28,710.78 = 11,373.60 : x
  2. Step 2: Convert to fraction form
    20,805/28,710.78 = 11,373.60/x
  3. Step 3: Cross multiply
    20,805x = 28,710.78 × 11,373.60
  4. Step 4: Simplify right side
    20,805x = 326,544,927.41
  5. Step 5: Solve for x
    x = 326,544,927.41/20,805
  6. Step 6: Final answer
    x = 15,695.50

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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.