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Finding the Fourth Proportional to 21,201.45, 31,816.75 and 7,350.45

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Solution

The fourth proportional to 21,201.45, 31,816.75 and 7,350.45 is: 11,030.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,201.45 : 31,816.75 = 7,350.45 : x
  2. Step 2: Convert to fraction form
    21,201.45/31,816.75 = 7,350.45/x
  3. Step 3: Cross multiply
    21,201.45x = 31,816.75 × 7,350.45
  4. Step 4: Simplify right side
    21,201.45x = 233,867,292.35
  5. Step 5: Solve for x
    x = 233,867,292.35/21,201.45
  6. Step 6: Final answer
    x = 11,030.72

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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.