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Finding the Fourth Proportional to 663,840,516.40, 996,516,601.80 and 391,364,810.80

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Solution

The fourth proportional to 663,840,516.40, 996,516,601.80 and 391,364,810.80 is: 587,492,811.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,840,516.40 : 996,516,601.80 = 391,364,810.80 : x
  2. Step 2: Convert to fraction form
    663,840,516.40/996,516,601.80 = 391,364,810.80/x
  3. Step 3: Cross multiply
    663,840,516.40x = 996,516,601.80 × 391,364,810.80
  4. Step 4: Simplify right side
    663,840,516.40x = 390,001,531,322,515,904
  5. Step 5: Solve for x
    x = 390,001,531,322,515,904/663,840,516.40
  6. Step 6: Final answer
    x = 587,492,811.43

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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.