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Finding the Fourth Proportional to 18,816.70, 28,225.05 and 7,129.30

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Solution

The fourth proportional to 18,816.70, 28,225.05 and 7,129.30 is: 10,693.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,816.70 : 28,225.05 = 7,129.30 : x
  2. Step 2: Convert to fraction form
    18,816.70/28,225.05 = 7,129.30/x
  3. Step 3: Cross multiply
    18,816.70x = 28,225.05 × 7,129.30
  4. Step 4: Simplify right side
    18,816.70x = 201,224,848.97
  5. Step 5: Solve for x
    x = 201,224,848.97/18,816.70
  6. Step 6: Final answer
    x = 10,693.95

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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.