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Finding the Fourth Proportional to 718,741,108, 991,862,728.32 and 388,716,246.64

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Solution

The fourth proportional to 718,741,108, 991,862,728.32 and 388,716,246.64 is: 536,428,419.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,741,108 : 991,862,728.32 = 388,716,246.64 : x
  2. Step 2: Convert to fraction form
    718,741,108/991,862,728.32 = 388,716,246.64/x
  3. Step 3: Cross multiply
    718,741,108x = 991,862,728.32 × 388,716,246.64
  4. Step 4: Simplify right side
    718,741,108x = 385,553,156,934,660,416
  5. Step 5: Solve for x
    x = 385,553,156,934,660,416/718,741,108
  6. Step 6: Final answer
    x = 536,428,419.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.