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Finding the Fourth Proportional to 432.51, 645.34 and 406.25

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Solution

The fourth proportional to 432.51, 645.34 and 406.25 is: 606.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.51 : 645.34 = 406.25 : x
  2. Step 2: Convert to fraction form
    432.51/645.34 = 406.25/x
  3. Step 3: Cross multiply
    432.51x = 645.34 × 406.25
  4. Step 4: Simplify right side
    432.51x = 262,169.38
  5. Step 5: Solve for x
    x = 262,169.38/432.51
  6. Step 6: Final answer
    x = 606.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.