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Finding the Fourth Proportional to 389.12, 583.61 and 145.58

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Solution

The fourth proportional to 389.12, 583.61 and 145.58 is: 218.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.12 : 583.61 = 145.58 : x
  2. Step 2: Convert to fraction form
    389.12/583.61 = 145.58/x
  3. Step 3: Cross multiply
    389.12x = 583.61 × 145.58
  4. Step 4: Simplify right side
    389.12x = 84,958.30
  5. Step 5: Solve for x
    x = 84,958.30/389.12
  6. Step 6: Final answer
    x = 218.34

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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.