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Finding the Fourth Proportional to 18,750.40, 28,125.60 and 9,419.20

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Solution

The fourth proportional to 18,750.40, 28,125.60 and 9,419.20 is: 14,128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,750.40 : 28,125.60 = 9,419.20 : x
  2. Step 2: Convert to fraction form
    18,750.40/28,125.60 = 9,419.20/x
  3. Step 3: Cross multiply
    18,750.40x = 28,125.60 × 9,419.20
  4. Step 4: Simplify right side
    18,750.40x = 264,920,651.52
  5. Step 5: Solve for x
    x = 264,920,651.52/18,750.40
  6. Step 6: Final answer
    x = 14,128.80

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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.