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Finding the Fourth Proportional to 389.21, 583.76 and 145.68

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Solution

The fourth proportional to 389.21, 583.76 and 145.68 is: 218.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.21 : 583.76 = 145.68 : x
  2. Step 2: Convert to fraction form
    389.21/583.76 = 145.68/x
  3. Step 3: Cross multiply
    389.21x = 583.76 × 145.68
  4. Step 4: Simplify right side
    389.21x = 85,042.16
  5. Step 5: Solve for x
    x = 85,042.16/389.21
  6. Step 6: Final answer
    x = 218.50

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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.