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Finding the Fourth Proportional to 430.35, 645.74 and 213.93

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Solution

The fourth proportional to 430.35, 645.74 and 213.93 is: 321.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.35 : 645.74 = 213.93 : x
  2. Step 2: Convert to fraction form
    430.35/645.74 = 213.93/x
  3. Step 3: Cross multiply
    430.35x = 645.74 × 213.93
  4. Step 4: Simplify right side
    430.35x = 138,142.89
  5. Step 5: Solve for x
    x = 138,142.89/430.35
  6. Step 6: Final answer
    x = 321.00

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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.