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Finding the Fourth Proportional to 1,102.07, 1,520.66 and 728.84

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Solution

The fourth proportional to 1,102.07, 1,520.66 and 728.84 is: 1,005.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.07 : 1,520.66 = 728.84 : x
  2. Step 2: Convert to fraction form
    1,102.07/1,520.66 = 728.84/x
  3. Step 3: Cross multiply
    1,102.07x = 1,520.66 × 728.84
  4. Step 4: Simplify right side
    1,102.07x = 1,108,317.99
  5. Step 5: Solve for x
    x = 1,108,317.99/1,102.07
  6. Step 6: Final answer
    x = 1,005.67

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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.