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Finding the Fourth Proportional to 81,737.12, 122,108.80 and 51,916.16

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Solution

The fourth proportional to 81,737.12, 122,108.80 and 51,916.16 is: 77,558.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,737.12 : 122,108.80 = 51,916.16 : x
  2. Step 2: Convert to fraction form
    81,737.12/122,108.80 = 51,916.16/x
  3. Step 3: Cross multiply
    81,737.12x = 122,108.80 × 51,916.16
  4. Step 4: Simplify right side
    81,737.12x = 6,339,419,998.21
  5. Step 5: Solve for x
    x = 6,339,419,998.21/81,737.12
  6. Step 6: Final answer
    x = 77,558.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.