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Finding the Fourth Proportional to 432.90, 598.05 and 389.70

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Solution

The fourth proportional to 432.90, 598.05 and 389.70 is: 538.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.90 : 598.05 = 389.70 : x
  2. Step 2: Convert to fraction form
    432.90/598.05 = 389.70/x
  3. Step 3: Cross multiply
    432.90x = 598.05 × 389.70
  4. Step 4: Simplify right side
    432.90x = 233,060.09
  5. Step 5: Solve for x
    x = 233,060.09/432.90
  6. Step 6: Final answer
    x = 538.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.