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Finding the Fourth Proportional to 858.33, 1,287.45 and 492.39

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Solution

The fourth proportional to 858.33, 1,287.45 and 492.39 is: 738.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.33 : 1,287.45 = 492.39 : x
  2. Step 2: Convert to fraction form
    858.33/1,287.45 = 492.39/x
  3. Step 3: Cross multiply
    858.33x = 1,287.45 × 492.39
  4. Step 4: Simplify right side
    858.33x = 633,927.51
  5. Step 5: Solve for x
    x = 633,927.51/858.33
  6. Step 6: Final answer
    x = 738.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.