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Finding the Fourth Proportional to 18,968.76, 28,459.62 and 7,124.22

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Solution

The fourth proportional to 18,968.76, 28,459.62 and 7,124.22 is: 10,688.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,968.76 : 28,459.62 = 7,124.22 : x
  2. Step 2: Convert to fraction form
    18,968.76/28,459.62 = 7,124.22/x
  3. Step 3: Cross multiply
    18,968.76x = 28,459.62 × 7,124.22
  4. Step 4: Simplify right side
    18,968.76x = 202,752,594.00
  5. Step 5: Solve for x
    x = 202,752,594.00/18,968.76
  6. Step 6: Final answer
    x = 10,688.76

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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.