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Finding the Fourth Proportional to 20,805.60, 28,712.80 and 11,374.08

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Solution

The fourth proportional to 20,805.60, 28,712.80 and 11,374.08 is: 15,696.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.60 : 28,712.80 = 11,374.08 : x
  2. Step 2: Convert to fraction form
    20,805.60/28,712.80 = 11,374.08/x
  3. Step 3: Cross multiply
    20,805.60x = 28,712.80 × 11,374.08
  4. Step 4: Simplify right side
    20,805.60x = 326,581,684.22
  5. Step 5: Solve for x
    x = 326,581,684.22/20,805.60
  6. Step 6: Final answer
    x = 15,696.82

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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.