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Finding the Fourth Proportional to 210,979,751.20, 316,469,626.80 and 207,200,615.20

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Solution

The fourth proportional to 210,979,751.20, 316,469,626.80 and 207,200,615.20 is: 310,800,922.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,979,751.20 : 316,469,626.80 = 207,200,615.20 : x
  2. Step 2: Convert to fraction form
    210,979,751.20/316,469,626.80 = 207,200,615.20/x
  3. Step 3: Cross multiply
    210,979,751.20x = 316,469,626.80 × 207,200,615.20
  4. Step 4: Simplify right side
    210,979,751.20x = 65,572,701,365,074,408
  5. Step 5: Solve for x
    x = 65,572,701,365,074,408/210,979,751.20
  6. Step 6: Final answer
    x = 310,800,922.80

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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.