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Finding the Fourth Proportional to 430.25, 647.96 and 391.37

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Solution

The fourth proportional to 430.25, 647.96 and 391.37 is: 589.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.25 : 647.96 = 391.37 : x
  2. Step 2: Convert to fraction form
    430.25/647.96 = 391.37/x
  3. Step 3: Cross multiply
    430.25x = 647.96 × 391.37
  4. Step 4: Simplify right side
    430.25x = 253,594.70
  5. Step 5: Solve for x
    x = 253,594.70/430.25
  6. Step 6: Final answer
    x = 589.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.