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Finding the Fourth Proportional to 430.50, 646.67 and 308.40

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Solution

The fourth proportional to 430.50, 646.67 and 308.40 is: 463.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.50 : 646.67 = 308.40 : x
  2. Step 2: Convert to fraction form
    430.50/646.67 = 308.40/x
  3. Step 3: Cross multiply
    430.50x = 646.67 × 308.40
  4. Step 4: Simplify right side
    430.50x = 199,433.03
  5. Step 5: Solve for x
    x = 199,433.03/430.50
  6. Step 6: Final answer
    x = 463.26

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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.