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Finding the Fourth Proportional to 389.15, 583.50 and 145.55

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Solution

The fourth proportional to 389.15, 583.50 and 145.55 is: 218.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.15 : 583.50 = 145.55 : x
  2. Step 2: Convert to fraction form
    389.15/583.50 = 145.55/x
  3. Step 3: Cross multiply
    389.15x = 583.50 × 145.55
  4. Step 4: Simplify right side
    389.15x = 84,927.15
  5. Step 5: Solve for x
    x = 84,927.15/389.15
  6. Step 6: Final answer
    x = 218.24

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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.