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Finding the Fourth Proportional to 1,109.65, 1,531.29 and 637.45

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Solution

The fourth proportional to 1,109.65, 1,531.29 and 637.45 is: 879.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.65 : 1,531.29 = 637.45 : x
  2. Step 2: Convert to fraction form
    1,109.65/1,531.29 = 637.45/x
  3. Step 3: Cross multiply
    1,109.65x = 1,531.29 × 637.45
  4. Step 4: Simplify right side
    1,109.65x = 976,120.81
  5. Step 5: Solve for x
    x = 976,120.81/1,109.65
  6. Step 6: Final answer
    x = 879.67

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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.