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Finding the Fourth Proportional to 833.76, 1,151.69 and 638.28

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Solution

The fourth proportional to 833.76, 1,151.69 and 638.28 is: 881.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.76 : 1,151.69 = 638.28 : x
  2. Step 2: Convert to fraction form
    833.76/1,151.69 = 638.28/x
  3. Step 3: Cross multiply
    833.76x = 1,151.69 × 638.28
  4. Step 4: Simplify right side
    833.76x = 735,097.50
  5. Step 5: Solve for x
    x = 735,097.50/833.76
  6. Step 6: Final answer
    x = 881.67

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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.