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Finding the Fourth Proportional to 718,697,301.12, 991,805,264.32 and 388,672,440.12

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Solution

The fourth proportional to 718,697,301.12, 991,805,264.32 and 388,672,440.12 is: 536,369,583.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,301.12 : 991,805,264.32 = 388,672,440.12 : x
  2. Step 2: Convert to fraction form
    718,697,301.12/991,805,264.32 = 388,672,440.12/x
  3. Step 3: Cross multiply
    718,697,301.12x = 991,805,264.32 × 388,672,440.12
  4. Step 4: Simplify right side
    718,697,301.12x = 385,487,372,207,115,968
  5. Step 5: Solve for x
    x = 385,487,372,207,115,968/718,697,301.12
  6. Step 6: Final answer
    x = 536,369,583.70

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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.