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Finding the Fourth Proportional to 899.75, 1,242.20 and 589.79

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Solution

The fourth proportional to 899.75, 1,242.20 and 589.79 is: 814.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.75 : 1,242.20 = 589.79 : x
  2. Step 2: Convert to fraction form
    899.75/1,242.20 = 589.79/x
  3. Step 3: Cross multiply
    899.75x = 1,242.20 × 589.79
  4. Step 4: Simplify right side
    899.75x = 732,634.19
  5. Step 5: Solve for x
    x = 732,634.19/899.75
  6. Step 6: Final answer
    x = 814.26

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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.