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Finding the Fourth Proportional to 21,913.16, 30,243.96 and 21,184.16

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Solution

The fourth proportional to 21,913.16, 30,243.96 and 21,184.16 is: 29,237.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,913.16 : 30,243.96 = 21,184.16 : x
  2. Step 2: Convert to fraction form
    21,913.16/30,243.96 = 21,184.16/x
  3. Step 3: Cross multiply
    21,913.16x = 30,243.96 × 21,184.16
  4. Step 4: Simplify right side
    21,913.16x = 640,692,887.67
  5. Step 5: Solve for x
    x = 640,692,887.67/21,913.16
  6. Step 6: Final answer
    x = 29,237.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.