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Finding the Fourth Proportional to 691,182, 953,880.12 and 389,376

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Solution

The fourth proportional to 691,182, 953,880.12 and 389,376 is: 537,366.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,182 : 953,880.12 = 389,376 : x
  2. Step 2: Convert to fraction form
    691,182/953,880.12 = 389,376/x
  3. Step 3: Cross multiply
    691,182x = 953,880.12 × 389,376
  4. Step 4: Simplify right side
    691,182x = 371,418,025,605.12
  5. Step 5: Solve for x
    x = 371,418,025,605.12/691,182
  6. Step 6: Final answer
    x = 537,366.46

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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.