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Finding the Fourth Proportional to 572.69, 859.95 and 389.99

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Solution

The fourth proportional to 572.69, 859.95 and 389.99 is: 585.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.69 : 859.95 = 389.99 : x
  2. Step 2: Convert to fraction form
    572.69/859.95 = 389.99/x
  3. Step 3: Cross multiply
    572.69x = 859.95 × 389.99
  4. Step 4: Simplify right side
    572.69x = 335,374.05
  5. Step 5: Solve for x
    x = 335,374.05/572.69
  6. Step 6: Final answer
    x = 585.61

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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.