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Finding the Fourth Proportional to 432.91, 647.77 and 259.66

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Solution

The fourth proportional to 432.91, 647.77 and 259.66 is: 388.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.91 : 647.77 = 259.66 : x
  2. Step 2: Convert to fraction form
    432.91/647.77 = 259.66/x
  3. Step 3: Cross multiply
    432.91x = 647.77 × 259.66
  4. Step 4: Simplify right side
    432.91x = 168,199.96
  5. Step 5: Solve for x
    x = 168,199.96/432.91
  6. Step 6: Final answer
    x = 388.53

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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.