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Finding the Fourth Proportional to 899.81, 1,240.53 and 689.62

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Solution

The fourth proportional to 899.81, 1,240.53 and 689.62 is: 950.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.81 : 1,240.53 = 689.62 : x
  2. Step 2: Convert to fraction form
    899.81/1,240.53 = 689.62/x
  3. Step 3: Cross multiply
    899.81x = 1,240.53 × 689.62
  4. Step 4: Simplify right side
    899.81x = 855,494.82
  5. Step 5: Solve for x
    x = 855,494.82/899.81
  6. Step 6: Final answer
    x = 950.75

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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.