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Finding the Fourth Proportional to 468.10, 645.42 and 320.86

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Solution

The fourth proportional to 468.10, 645.42 and 320.86 is: 442.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.10 : 645.42 = 320.86 : x
  2. Step 2: Convert to fraction form
    468.10/645.42 = 320.86/x
  3. Step 3: Cross multiply
    468.10x = 645.42 × 320.86
  4. Step 4: Simplify right side
    468.10x = 207,089.46
  5. Step 5: Solve for x
    x = 207,089.46/468.10
  6. Step 6: Final answer
    x = 442.40

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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.