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Finding the Fourth Proportional to 431.02, 646.26 and 214.84

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Solution

The fourth proportional to 431.02, 646.26 and 214.84 is: 322.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.02 : 646.26 = 214.84 : x
  2. Step 2: Convert to fraction form
    431.02/646.26 = 214.84/x
  3. Step 3: Cross multiply
    431.02x = 646.26 × 214.84
  4. Step 4: Simplify right side
    431.02x = 138,842.50
  5. Step 5: Solve for x
    x = 138,842.50/431.02
  6. Step 6: Final answer
    x = 322.13

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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.