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Finding the Fourth Proportional to 55,916.40, 83,876.40 and 20,859.60

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Solution

The fourth proportional to 55,916.40, 83,876.40 and 20,859.60 is: 31,290.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,916.40 : 83,876.40 = 20,859.60 : x
  2. Step 2: Convert to fraction form
    55,916.40/83,876.40 = 20,859.60/x
  3. Step 3: Cross multiply
    55,916.40x = 83,876.40 × 20,859.60
  4. Step 4: Simplify right side
    55,916.40x = 1,749,628,153.44
  5. Step 5: Solve for x
    x = 1,749,628,153.44/55,916.40
  6. Step 6: Final answer
    x = 31,290.07

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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.