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Finding the Fourth Proportional to 430.94, 646.63 and 211.64

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Solution

The fourth proportional to 430.94, 646.63 and 211.64 is: 317.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.94 : 646.63 = 211.64 : x
  2. Step 2: Convert to fraction form
    430.94/646.63 = 211.64/x
  3. Step 3: Cross multiply
    430.94x = 646.63 × 211.64
  4. Step 4: Simplify right side
    430.94x = 136,849.01
  5. Step 5: Solve for x
    x = 136,849.01/430.94
  6. Step 6: Final answer
    x = 317.56

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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.