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Finding the Fourth Proportional to 353,115.10, 529,672.65 and 128,728.90

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Solution

The fourth proportional to 353,115.10, 529,672.65 and 128,728.90 is: 193,093.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,115.10 : 529,672.65 = 128,728.90 : x
  2. Step 2: Convert to fraction form
    353,115.10/529,672.65 = 128,728.90/x
  3. Step 3: Cross multiply
    353,115.10x = 529,672.65 × 128,728.90
  4. Step 4: Simplify right side
    353,115.10x = 68,184,177,594.59
  5. Step 5: Solve for x
    x = 68,184,177,594.59/353,115.10
  6. Step 6: Final answer
    x = 193,093.35

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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.