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Finding the Fourth Proportional to 18,950.78, 28,426.15 and 5,099.78

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Solution

The fourth proportional to 18,950.78, 28,426.15 and 5,099.78 is: 7,649.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,950.78 : 28,426.15 = 5,099.78 : x
  2. Step 2: Convert to fraction form
    18,950.78/28,426.15 = 5,099.78/x
  3. Step 3: Cross multiply
    18,950.78x = 28,426.15 × 5,099.78
  4. Step 4: Simplify right side
    18,950.78x = 144,967,111.25
  5. Step 5: Solve for x
    x = 144,967,111.25/18,950.78
  6. Step 6: Final answer
    x = 7,649.66

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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.