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Finding the Fourth Proportional to 353,176.40, 530,000.16 and 128,536.78

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Solution

The fourth proportional to 353,176.40, 530,000.16 and 128,536.78 is: 192,890.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,176.40 : 530,000.16 = 128,536.78 : x
  2. Step 2: Convert to fraction form
    353,176.40/530,000.16 = 128,536.78/x
  3. Step 3: Cross multiply
    353,176.40x = 530,000.16 × 128,536.78
  4. Step 4: Simplify right side
    353,176.40x = 68,124,513,965.88
  5. Step 5: Solve for x
    x = 68,124,513,965.88/353,176.40
  6. Step 6: Final answer
    x = 192,890.90

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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.