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Finding the Fourth Proportional to 78.04, 116.99 and 26.67

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Solution

The fourth proportional to 78.04, 116.99 and 26.67 is: 39.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.04 : 116.99 = 26.67 : x
  2. Step 2: Convert to fraction form
    78.04/116.99 = 26.67/x
  3. Step 3: Cross multiply
    78.04x = 116.99 × 26.67
  4. Step 4: Simplify right side
    78.04x = 3,119.99
  5. Step 5: Solve for x
    x = 3,119.99/78.04
  6. Step 6: Final answer
    x = 39.98

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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.