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Finding the Fourth Proportional to 389.05, 536.07 and 357.61

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Solution

The fourth proportional to 389.05, 536.07 and 357.61 is: 492.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.05 : 536.07 = 357.61 : x
  2. Step 2: Convert to fraction form
    389.05/536.07 = 357.61/x
  3. Step 3: Cross multiply
    389.05x = 536.07 × 357.61
  4. Step 4: Simplify right side
    389.05x = 191,703.99
  5. Step 5: Solve for x
    x = 191,703.99/389.05
  6. Step 6: Final answer
    x = 492.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.