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Finding the Fourth Proportional to 1,382.99, 2,072.98 and 690.17

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Solution

The fourth proportional to 1,382.99, 2,072.98 and 690.17 is: 1,034.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.99 : 2,072.98 = 690.17 : x
  2. Step 2: Convert to fraction form
    1,382.99/2,072.98 = 690.17/x
  3. Step 3: Cross multiply
    1,382.99x = 2,072.98 × 690.17
  4. Step 4: Simplify right side
    1,382.99x = 1,430,708.61
  5. Step 5: Solve for x
    x = 1,430,708.61/1,382.99
  6. Step 6: Final answer
    x = 1,034.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.