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Finding the Fourth Proportional to 899.38, 1,241.40 and 637.48

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Solution

The fourth proportional to 899.38, 1,241.40 and 637.48 is: 879.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.38 : 1,241.40 = 637.48 : x
  2. Step 2: Convert to fraction form
    899.38/1,241.40 = 637.48/x
  3. Step 3: Cross multiply
    899.38x = 1,241.40 × 637.48
  4. Step 4: Simplify right side
    899.38x = 791,367.67
  5. Step 5: Solve for x
    x = 791,367.67/899.38
  6. Step 6: Final answer
    x = 879.90

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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.