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Finding the Fourth Proportional to 660,175.20, 990,335.70 and 210,819.60

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Solution

The fourth proportional to 660,175.20, 990,335.70 and 210,819.60 is: 316,252.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,175.20 : 990,335.70 = 210,819.60 : x
  2. Step 2: Convert to fraction form
    660,175.20/990,335.70 = 210,819.60/x
  3. Step 3: Cross multiply
    660,175.20x = 990,335.70 × 210,819.60
  4. Step 4: Simplify right side
    660,175.20x = 208,782,176,139.72
  5. Step 5: Solve for x
    x = 208,782,176,139.72/660,175.20
  6. Step 6: Final answer
    x = 316,252.68

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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.