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Finding the Fourth Proportional to 353,307.21, 529,640.09 and 128,508.72

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Solution

The fourth proportional to 353,307.21, 529,640.09 and 128,508.72 is: 192,646.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,307.21 : 529,640.09 = 128,508.72 : x
  2. Step 2: Convert to fraction form
    353,307.21/529,640.09 = 128,508.72/x
  3. Step 3: Cross multiply
    353,307.21x = 529,640.09 × 128,508.72
  4. Step 4: Simplify right side
    353,307.21x = 68,063,369,730.84
  5. Step 5: Solve for x
    x = 68,063,369,730.84/353,307.21
  6. Step 6: Final answer
    x = 192,646.42

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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.