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Finding the Fourth Proportional to 873.03, 1,315.37 and 789.74

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Solution

The fourth proportional to 873.03, 1,315.37 and 789.74 is: 1,189.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.03 : 1,315.37 = 789.74 : x
  2. Step 2: Convert to fraction form
    873.03/1,315.37 = 789.74/x
  3. Step 3: Cross multiply
    873.03x = 1,315.37 × 789.74
  4. Step 4: Simplify right side
    873.03x = 1,038,805.57
  5. Step 5: Solve for x
    x = 1,038,805.57/873.03
  6. Step 6: Final answer
    x = 1,189.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.