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Finding the Fourth Proportional to 983.75, 1,357.70 and 817.67

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Solution

The fourth proportional to 983.75, 1,357.70 and 817.67 is: 1,128.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.75 : 1,357.70 = 817.67 : x
  2. Step 2: Convert to fraction form
    983.75/1,357.70 = 817.67/x
  3. Step 3: Cross multiply
    983.75x = 1,357.70 × 817.67
  4. Step 4: Simplify right side
    983.75x = 1,110,149.86
  5. Step 5: Solve for x
    x = 1,110,149.86/983.75
  6. Step 6: Final answer
    x = 1,128.49

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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.