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Finding the Fourth Proportional to 112,728.29, 155,558.83 and 61,731.12

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Solution

The fourth proportional to 112,728.29, 155,558.83 and 61,731.12 is: 85,185.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,728.29 : 155,558.83 = 61,731.12 : x
  2. Step 2: Convert to fraction form
    112,728.29/155,558.83 = 61,731.12/x
  3. Step 3: Cross multiply
    112,728.29x = 155,558.83 × 61,731.12
  4. Step 4: Simplify right side
    112,728.29x = 9,602,820,024.00
  5. Step 5: Solve for x
    x = 9,602,820,024.00/112,728.29
  6. Step 6: Final answer
    x = 85,185.54

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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.