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Finding the Fourth Proportional to 432.36, 651.42 and 391.28

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Solution

The fourth proportional to 432.36, 651.42 and 391.28 is: 589.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.36 : 651.42 = 391.28 : x
  2. Step 2: Convert to fraction form
    432.36/651.42 = 391.28/x
  3. Step 3: Cross multiply
    432.36x = 651.42 × 391.28
  4. Step 4: Simplify right side
    432.36x = 254,884.36
  5. Step 5: Solve for x
    x = 254,884.36/432.36
  6. Step 6: Final answer
    x = 589.53

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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.