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Finding the Fourth Proportional to 430.06, 644.67 and 186.25

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Solution

The fourth proportional to 430.06, 644.67 and 186.25 is: 279.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.06 : 644.67 = 186.25 : x
  2. Step 2: Convert to fraction form
    430.06/644.67 = 186.25/x
  3. Step 3: Cross multiply
    430.06x = 644.67 × 186.25
  4. Step 4: Simplify right side
    430.06x = 120,069.79
  5. Step 5: Solve for x
    x = 120,069.79/430.06
  6. Step 6: Final answer
    x = 279.19

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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.