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Finding the Fourth Proportional to 899.89, 1,240.32 and 634.44

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Solution

The fourth proportional to 899.89, 1,240.32 and 634.44 is: 874.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.89 : 1,240.32 = 634.44 : x
  2. Step 2: Convert to fraction form
    899.89/1,240.32 = 634.44/x
  3. Step 3: Cross multiply
    899.89x = 1,240.32 × 634.44
  4. Step 4: Simplify right side
    899.89x = 786,908.62
  5. Step 5: Solve for x
    x = 786,908.62/899.89
  6. Step 6: Final answer
    x = 874.45

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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.