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Finding the Fourth Proportional to 389.01, 583.15 and 145.70

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Solution

The fourth proportional to 389.01, 583.15 and 145.70 is: 218.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.01 : 583.15 = 145.70 : x
  2. Step 2: Convert to fraction form
    389.01/583.15 = 145.70/x
  3. Step 3: Cross multiply
    389.01x = 583.15 × 145.70
  4. Step 4: Simplify right side
    389.01x = 84,964.96
  5. Step 5: Solve for x
    x = 84,964.96/389.01
  6. Step 6: Final answer
    x = 218.41

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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.