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Finding the Fourth Proportional to 112,670.91, 155,485.90 and 61,686.94

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Solution

The fourth proportional to 112,670.91, 155,485.90 and 61,686.94 is: 85,128.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,670.91 : 155,485.90 = 61,686.94 : x
  2. Step 2: Convert to fraction form
    112,670.91/155,485.90 = 61,686.94/x
  3. Step 3: Cross multiply
    112,670.91x = 155,485.90 × 61,686.94
  4. Step 4: Simplify right side
    112,670.91x = 9,591,449,974.87
  5. Step 5: Solve for x
    x = 9,591,449,974.87/112,670.91
  6. Step 6: Final answer
    x = 85,128.01

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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.