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Finding the Fourth Proportional to 389.07, 583.48 and 129.01

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Solution

The fourth proportional to 389.07, 583.48 and 129.01 is: 193.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.07 : 583.48 = 129.01 : x
  2. Step 2: Convert to fraction form
    389.07/583.48 = 129.01/x
  3. Step 3: Cross multiply
    389.07x = 583.48 × 129.01
  4. Step 4: Simplify right side
    389.07x = 75,274.39
  5. Step 5: Solve for x
    x = 75,274.39/389.07
  6. Step 6: Final answer
    x = 193.47

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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.