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Finding the Fourth Proportional to 280.36, 420.58 and 97.77

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Solution

The fourth proportional to 280.36, 420.58 and 97.77 is: 146.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.36 : 420.58 = 97.77 : x
  2. Step 2: Convert to fraction form
    280.36/420.58 = 97.77/x
  3. Step 3: Cross multiply
    280.36x = 420.58 × 97.77
  4. Step 4: Simplify right side
    280.36x = 41,119.86
  5. Step 5: Solve for x
    x = 41,119.86/280.36
  6. Step 6: Final answer
    x = 146.67

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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.