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Finding the Fourth Proportional to 328.19, 489.51 and 307.67

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Solution

The fourth proportional to 328.19, 489.51 and 307.67 is: 458.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.19 : 489.51 = 307.67 : x
  2. Step 2: Convert to fraction form
    328.19/489.51 = 307.67/x
  3. Step 3: Cross multiply
    328.19x = 489.51 × 307.67
  4. Step 4: Simplify right side
    328.19x = 150,605.09
  5. Step 5: Solve for x
    x = 150,605.09/328.19
  6. Step 6: Final answer
    x = 458.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.