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Finding the Fourth Proportional to 983.85, 1,475.78 and 253.41

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Solution

The fourth proportional to 983.85, 1,475.78 and 253.41 is: 380.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.85 : 1,475.78 = 253.41 : x
  2. Step 2: Convert to fraction form
    983.85/1,475.78 = 253.41/x
  3. Step 3: Cross multiply
    983.85x = 1,475.78 × 253.41
  4. Step 4: Simplify right side
    983.85x = 373,976.14
  5. Step 5: Solve for x
    x = 373,976.14/983.85
  6. Step 6: Final answer
    x = 380.12

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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.