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Finding the Fourth Proportional to 878.48, 1,317.93 and 391.67

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Solution

The fourth proportional to 878.48, 1,317.93 and 391.67 is: 587.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.48 : 1,317.93 = 391.67 : x
  2. Step 2: Convert to fraction form
    878.48/1,317.93 = 391.67/x
  3. Step 3: Cross multiply
    878.48x = 1,317.93 × 391.67
  4. Step 4: Simplify right side
    878.48x = 516,193.64
  5. Step 5: Solve for x
    x = 516,193.64/878.48
  6. Step 6: Final answer
    x = 587.60

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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.