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Finding the Fourth Proportional to 20,685.98, 30,809.88 and 20,585.18

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Solution

The fourth proportional to 20,685.98, 30,809.88 and 20,585.18 is: 30,659.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.98 : 30,809.88 = 20,585.18 : x
  2. Step 2: Convert to fraction form
    20,685.98/30,809.88 = 20,585.18/x
  3. Step 3: Cross multiply
    20,685.98x = 30,809.88 × 20,585.18
  4. Step 4: Simplify right side
    20,685.98x = 634,226,925.58
  5. Step 5: Solve for x
    x = 634,226,925.58/20,685.98
  6. Step 6: Final answer
    x = 30,659.75

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.