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Finding the Fourth Proportional to 1,089.24, 1,503 and 641.13

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Solution

The fourth proportional to 1,089.24, 1,503 and 641.13 is: 884.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.24 : 1,503 = 641.13 : x
  2. Step 2: Convert to fraction form
    1,089.24/1,503 = 641.13/x
  3. Step 3: Cross multiply
    1,089.24x = 1,503 × 641.13
  4. Step 4: Simplify right side
    1,089.24x = 963,618.39
  5. Step 5: Solve for x
    x = 963,618.39/1,089.24
  6. Step 6: Final answer
    x = 884.67

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Double scale
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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.