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Finding the Fourth Proportional to 430.43, 645.93 and 214.16

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Solution

The fourth proportional to 430.43, 645.93 and 214.16 is: 321.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.43 : 645.93 = 214.16 : x
  2. Step 2: Convert to fraction form
    430.43/645.93 = 214.16/x
  3. Step 3: Cross multiply
    430.43x = 645.93 × 214.16
  4. Step 4: Simplify right side
    430.43x = 138,329.14
  5. Step 5: Solve for x
    x = 138,329.14/430.43
  6. Step 6: Final answer
    x = 321.38

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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.