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Finding the Fourth Proportional to 370.86, 511.56 and 321.45

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Solution

The fourth proportional to 370.86, 511.56 and 321.45 is: 443.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.86 : 511.56 = 321.45 : x
  2. Step 2: Convert to fraction form
    370.86/511.56 = 321.45/x
  3. Step 3: Cross multiply
    370.86x = 511.56 × 321.45
  4. Step 4: Simplify right side
    370.86x = 164,440.96
  5. Step 5: Solve for x
    x = 164,440.96/370.86
  6. Step 6: Final answer
    x = 443.40

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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.