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Finding the Fourth Proportional to 1,073, 1,609.74 and 389

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Solution

The fourth proportional to 1,073, 1,609.74 and 389 is: 583.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073 : 1,609.74 = 389 : x
  2. Step 2: Convert to fraction form
    1,073/1,609.74 = 389/x
  3. Step 3: Cross multiply
    1,073x = 1,609.74 × 389
  4. Step 4: Simplify right side
    1,073x = 626,188.86
  5. Step 5: Solve for x
    x = 626,188.86/1,073
  6. Step 6: Final answer
    x = 583.59

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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.