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Finding the Fourth Proportional to 430.96, 646.74 and 286.72

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Solution

The fourth proportional to 430.96, 646.74 and 286.72 is: 430.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.96 : 646.74 = 286.72 : x
  2. Step 2: Convert to fraction form
    430.96/646.74 = 286.72/x
  3. Step 3: Cross multiply
    430.96x = 646.74 × 286.72
  4. Step 4: Simplify right side
    430.96x = 185,433.29
  5. Step 5: Solve for x
    x = 185,433.29/430.96
  6. Step 6: Final answer
    x = 430.28

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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.