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Finding the Fourth Proportional to 122,661.70, 183,992.55 and 85,336.90

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Solution

The fourth proportional to 122,661.70, 183,992.55 and 85,336.90 is: 128,005.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,661.70 : 183,992.55 = 85,336.90 : x
  2. Step 2: Convert to fraction form
    122,661.70/183,992.55 = 85,336.90/x
  3. Step 3: Cross multiply
    122,661.70x = 183,992.55 × 85,336.90
  4. Step 4: Simplify right side
    122,661.70x = 15,701,353,840.10
  5. Step 5: Solve for x
    x = 15,701,353,840.10/122,661.70
  6. Step 6: Final answer
    x = 128,005.35

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1.5x scale

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.