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Finding the Fourth Proportional to 573, 790.90 and 389

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Solution

The fourth proportional to 573, 790.90 and 389 is: 536.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    573 : 790.90 = 389 : x
  2. Step 2: Convert to fraction form
    573/790.90 = 389/x
  3. Step 3: Cross multiply
    573x = 790.90 × 389
  4. Step 4: Simplify right side
    573x = 307,660.10
  5. Step 5: Solve for x
    x = 307,660.10/573
  6. Step 6: Final answer
    x = 536.93

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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.