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Finding the Fourth Proportional to 430.84, 645.40 and 211.04

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Solution

The fourth proportional to 430.84, 645.40 and 211.04 is: 316.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.84 : 645.40 = 211.04 : x
  2. Step 2: Convert to fraction form
    430.84/645.40 = 211.04/x
  3. Step 3: Cross multiply
    430.84x = 645.40 × 211.04
  4. Step 4: Simplify right side
    430.84x = 136,205.22
  5. Step 5: Solve for x
    x = 136,205.22/430.84
  6. Step 6: Final answer
    x = 316.14

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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.