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Finding the Fourth Proportional to 21,916.16, 30,248.09 and 21,187.16

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Solution

The fourth proportional to 21,916.16, 30,248.09 and 21,187.16 is: 29,241.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,916.16 : 30,248.09 = 21,187.16 : x
  2. Step 2: Convert to fraction form
    21,916.16/30,248.09 = 21,187.16/x
  3. Step 3: Cross multiply
    21,916.16x = 30,248.09 × 21,187.16
  4. Step 4: Simplify right side
    21,916.16x = 640,871,016.59
  5. Step 5: Solve for x
    x = 640,871,016.59/21,916.16
  6. Step 6: Final answer
    x = 29,241.94

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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.