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Finding the Fourth Proportional to 18,711.61, 28,071.88 and 6,231.74

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Solution

The fourth proportional to 18,711.61, 28,071.88 and 6,231.74 is: 9,349.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.61 : 28,071.88 = 6,231.74 : x
  2. Step 2: Convert to fraction form
    18,711.61/28,071.88 = 6,231.74/x
  3. Step 3: Cross multiply
    18,711.61x = 28,071.88 × 6,231.74
  4. Step 4: Simplify right side
    18,711.61x = 174,936,501.53
  5. Step 5: Solve for x
    x = 174,936,501.53/18,711.61
  6. Step 6: Final answer
    x = 9,349.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.