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Finding the Fourth Proportional to 421.86, 581.67 and 384.87

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Solution

The fourth proportional to 421.86, 581.67 and 384.87 is: 530.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.86 : 581.67 = 384.87 : x
  2. Step 2: Convert to fraction form
    421.86/581.67 = 384.87/x
  3. Step 3: Cross multiply
    421.86x = 581.67 × 384.87
  4. Step 4: Simplify right side
    421.86x = 223,867.33
  5. Step 5: Solve for x
    x = 223,867.33/421.86
  6. Step 6: Final answer
    x = 530.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.