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Finding the Fourth Proportional to 30,378.90, 45,531.90 and 15,580.20

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Solution

The fourth proportional to 30,378.90, 45,531.90 and 15,580.20 is: 23,351.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,378.90 : 45,531.90 = 15,580.20 : x
  2. Step 2: Convert to fraction form
    30,378.90/45,531.90 = 15,580.20/x
  3. Step 3: Cross multiply
    30,378.90x = 45,531.90 × 15,580.20
  4. Step 4: Simplify right side
    30,378.90x = 709,396,108.38
  5. Step 5: Solve for x
    x = 709,396,108.38/30,378.90
  6. Step 6: Final answer
    x = 23,351.61

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.