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Finding the Fourth Proportional to 18,999.55, 28,499.32 and 5,148.55

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Solution

The fourth proportional to 18,999.55, 28,499.32 and 5,148.55 is: 7,722.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.55 : 28,499.32 = 5,148.55 : x
  2. Step 2: Convert to fraction form
    18,999.55/28,499.32 = 5,148.55/x
  3. Step 3: Cross multiply
    18,999.55x = 28,499.32 × 5,148.55
  4. Step 4: Simplify right side
    18,999.55x = 146,730,173.99
  5. Step 5: Solve for x
    x = 146,730,173.99/18,999.55
  6. Step 6: Final answer
    x = 7,722.82

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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.