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Finding the Fourth Proportional to 385,265.53, 531,690.11 and 215,511.13

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Solution

The fourth proportional to 385,265.53, 531,690.11 and 215,511.13 is: 297,418.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,265.53 : 531,690.11 = 215,511.13 : x
  2. Step 2: Convert to fraction form
    385,265.53/531,690.11 = 215,511.13/x
  3. Step 3: Cross multiply
    385,265.53x = 531,690.11 × 215,511.13
  4. Step 4: Simplify right side
    385,265.53x = 114,585,136,415.92
  5. Step 5: Solve for x
    x = 114,585,136,415.92/385,265.53
  6. Step 6: Final answer
    x = 297,418.60

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1.5x scale

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.