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Finding the Fourth Proportional to 900.81, 1,240.79 and 840.33

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Solution

The fourth proportional to 900.81, 1,240.79 and 840.33 is: 1,157.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.81 : 1,240.79 = 840.33 : x
  2. Step 2: Convert to fraction form
    900.81/1,240.79 = 840.33/x
  3. Step 3: Cross multiply
    900.81x = 1,240.79 × 840.33
  4. Step 4: Simplify right side
    900.81x = 1,042,668.86
  5. Step 5: Solve for x
    x = 1,042,668.86/900.81
  6. Step 6: Final answer
    x = 1,157.48

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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.