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Finding the Fourth Proportional to 149,348.79, 206,129.49 and 85,728.15

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Solution

The fourth proportional to 149,348.79, 206,129.49 and 85,728.15 is: 118,321.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,348.79 : 206,129.49 = 85,728.15 : x
  2. Step 2: Convert to fraction form
    149,348.79/206,129.49 = 85,728.15/x
  3. Step 3: Cross multiply
    149,348.79x = 206,129.49 × 85,728.15
  4. Step 4: Simplify right side
    149,348.79x = 17,671,099,838.14
  5. Step 5: Solve for x
    x = 17,671,099,838.14/149,348.79
  6. Step 6: Final answer
    x = 118,321.01

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1.5x scale

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.