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Finding the Fourth Proportional to 900.53, 1,243.10 and 679.54

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Solution

The fourth proportional to 900.53, 1,243.10 and 679.54 is: 938.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.53 : 1,243.10 = 679.54 : x
  2. Step 2: Convert to fraction form
    900.53/1,243.10 = 679.54/x
  3. Step 3: Cross multiply
    900.53x = 1,243.10 × 679.54
  4. Step 4: Simplify right side
    900.53x = 844,726.56
  5. Step 5: Solve for x
    x = 844,726.56/900.53
  6. Step 6: Final answer
    x = 938.03

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Double scale
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1.5x scale

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.