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Finding the Fourth Proportional to 983.71, 1,475.25 and 919

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Solution

The fourth proportional to 983.71, 1,475.25 and 919 is: 1,378.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.71 : 1,475.25 = 919 : x
  2. Step 2: Convert to fraction form
    983.71/1,475.25 = 919/x
  3. Step 3: Cross multiply
    983.71x = 1,475.25 × 919
  4. Step 4: Simplify right side
    983.71x = 1,355,754.75
  5. Step 5: Solve for x
    x = 1,355,754.75/983.71
  6. Step 6: Final answer
    x = 1,378.21

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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.