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Finding the Fourth Proportional to 718,697,302.12, 991,805,265.70 and 388,672,441.12

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Solution

The fourth proportional to 718,697,302.12, 991,805,265.70 and 388,672,441.12 is: 536,369,585.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,302.12 : 991,805,265.70 = 388,672,441.12 : x
  2. Step 2: Convert to fraction form
    718,697,302.12/991,805,265.70 = 388,672,441.12/x
  3. Step 3: Cross multiply
    718,697,302.12x = 991,805,265.70 × 388,672,441.12
  4. Step 4: Simplify right side
    718,697,302.12x = 385,487,373,735,289,216
  5. Step 5: Solve for x
    x = 385,487,373,735,289,216/718,697,302.12
  6. Step 6: Final answer
    x = 536,369,585.08

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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.