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Finding the Fourth Proportional to 718,697,527.84, 991,805,576.40 and 388,672,666.88

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Solution

The fourth proportional to 718,697,527.84, 991,805,576.40 and 388,672,666.88 is: 536,369,896.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,527.84 : 991,805,576.40 = 388,672,666.88 : x
  2. Step 2: Convert to fraction form
    718,697,527.84/991,805,576.40 = 388,672,666.88/x
  3. Step 3: Cross multiply
    718,697,527.84x = 991,805,576.40 × 388,672,666.88
  4. Step 4: Simplify right side
    718,697,527.84x = 385,487,718,405,843,584
  5. Step 5: Solve for x
    x = 385,487,718,405,843,584/718,697,527.84
  6. Step 6: Final answer
    x = 536,369,896.20

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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.