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Finding the Fourth Proportional to 661,859,253.68, 991,497,328.83 and 515,608,019.69

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Solution

The fourth proportional to 661,859,253.68, 991,497,328.83 and 515,608,019.69 is: 772,405,872.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,859,253.68 : 991,497,328.83 = 515,608,019.69 : x
  2. Step 2: Convert to fraction form
    661,859,253.68/991,497,328.83 = 515,608,019.69/x
  3. Step 3: Cross multiply
    661,859,253.68x = 991,497,328.83 × 515,608,019.69
  4. Step 4: Simplify right side
    661,859,253.68x = 511,223,974,245,961,088
  5. Step 5: Solve for x
    x = 511,223,974,245,961,088/661,859,253.68
  6. Step 6: Final answer
    x = 772,405,872.40

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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.