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Finding the Fourth Proportional to 430.25, 645.30 and 210.83

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Solution

The fourth proportional to 430.25, 645.30 and 210.83 is: 316.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.25 : 645.30 = 210.83 : x
  2. Step 2: Convert to fraction form
    430.25/645.30 = 210.83/x
  3. Step 3: Cross multiply
    430.25x = 645.30 × 210.83
  4. Step 4: Simplify right side
    430.25x = 136,045.37
  5. Step 5: Solve for x
    x = 136,045.37/430.25
  6. Step 6: Final answer
    x = 316.20

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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.