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Finding the Fourth Proportional to 421.36, 632.66 and 259.72

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Solution

The fourth proportional to 421.36, 632.66 and 259.72 is: 389.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.36 : 632.66 = 259.72 : x
  2. Step 2: Convert to fraction form
    421.36/632.66 = 259.72/x
  3. Step 3: Cross multiply
    421.36x = 632.66 × 259.72
  4. Step 4: Simplify right side
    421.36x = 164,314.46
  5. Step 5: Solve for x
    x = 164,314.46/421.36
  6. Step 6: Final answer
    x = 389.96

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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.