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Finding the Fourth Proportional to 899.67, 1,240.59 and 689.49

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Solution

The fourth proportional to 899.67, 1,240.59 and 689.49 is: 950.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.67 : 1,240.59 = 689.49 : x
  2. Step 2: Convert to fraction form
    899.67/1,240.59 = 689.49/x
  3. Step 3: Cross multiply
    899.67x = 1,240.59 × 689.49
  4. Step 4: Simplify right side
    899.67x = 855,374.40
  5. Step 5: Solve for x
    x = 855,374.40/899.67
  6. Step 6: Final answer
    x = 950.76

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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.