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Finding the Fourth Proportional to 718,697,287.16, 991,805,245.02 and 388,672,426.16

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Solution

The fourth proportional to 718,697,287.16, 991,805,245.02 and 388,672,426.16 is: 536,369,564.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,287.16 : 991,805,245.02 = 388,672,426.16 : x
  2. Step 2: Convert to fraction form
    718,697,287.16/991,805,245.02 = 388,672,426.16/x
  3. Step 3: Cross multiply
    718,697,287.16x = 991,805,245.02 × 388,672,426.16
  4. Step 4: Simplify right side
    718,697,287.16x = 385,487,350,860,136,704
  5. Step 5: Solve for x
    x = 385,487,350,860,136,704/718,697,287.16
  6. Step 6: Final answer
    x = 536,369,564.41

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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.