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Finding the Fourth Proportional to 389.09, 583.65 and 100.54

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Solution

The fourth proportional to 389.09, 583.65 and 100.54 is: 150.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.09 : 583.65 = 100.54 : x
  2. Step 2: Convert to fraction form
    389.09/583.65 = 100.54/x
  3. Step 3: Cross multiply
    389.09x = 583.65 × 100.54
  4. Step 4: Simplify right side
    389.09x = 58,677.25
  5. Step 5: Solve for x
    x = 58,677.25/389.09
  6. Step 6: Final answer
    x = 150.81

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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.