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Finding the Fourth Proportional to 1,382.46, 1,907.99 and 885.12

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Solution

The fourth proportional to 1,382.46, 1,907.99 and 885.12 is: 1,221.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.46 : 1,907.99 = 885.12 : x
  2. Step 2: Convert to fraction form
    1,382.46/1,907.99 = 885.12/x
  3. Step 3: Cross multiply
    1,382.46x = 1,907.99 × 885.12
  4. Step 4: Simplify right side
    1,382.46x = 1,688,800.11
  5. Step 5: Solve for x
    x = 1,688,800.11/1,382.46
  6. Step 6: Final answer
    x = 1,221.59

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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.