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Finding the Fourth Proportional to 122,145.70, 183,218.55 and 92,621.20

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Solution

The fourth proportional to 122,145.70, 183,218.55 and 92,621.20 is: 138,931.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,145.70 : 183,218.55 = 92,621.20 : x
  2. Step 2: Convert to fraction form
    122,145.70/183,218.55 = 92,621.20/x
  3. Step 3: Cross multiply
    122,145.70x = 183,218.55 × 92,621.20
  4. Step 4: Simplify right side
    122,145.70x = 16,969,921,963.26
  5. Step 5: Solve for x
    x = 16,969,921,963.26/122,145.70
  6. Step 6: Final answer
    x = 138,931.80

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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.