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Finding the Fourth Proportional to 430.51, 646.08 and 214.15

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Solution

The fourth proportional to 430.51, 646.08 and 214.15 is: 321.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.51 : 646.08 = 214.15 : x
  2. Step 2: Convert to fraction form
    430.51/646.08 = 214.15/x
  3. Step 3: Cross multiply
    430.51x = 646.08 × 214.15
  4. Step 4: Simplify right side
    430.51x = 138,358.03
  5. Step 5: Solve for x
    x = 138,358.03/430.51
  6. Step 6: Final answer
    x = 321.38

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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.