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Finding the Fourth Proportional to 18,750.75, 28,126.40 and 4,899.75

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Solution

The fourth proportional to 18,750.75, 28,126.40 and 4,899.75 is: 7,349.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,750.75 : 28,126.40 = 4,899.75 : x
  2. Step 2: Convert to fraction form
    18,750.75/28,126.40 = 4,899.75/x
  3. Step 3: Cross multiply
    18,750.75x = 28,126.40 × 4,899.75
  4. Step 4: Simplify right side
    18,750.75x = 137,812,328.40
  5. Step 5: Solve for x
    x = 137,812,328.40/18,750.75
  6. Step 6: Final answer
    x = 7,349.70

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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.