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Finding the Fourth Proportional to 1,543.96, 2,315.94 and 389.72

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Solution

The fourth proportional to 1,543.96, 2,315.94 and 389.72 is: 584.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.96 : 2,315.94 = 389.72 : x
  2. Step 2: Convert to fraction form
    1,543.96/2,315.94 = 389.72/x
  3. Step 3: Cross multiply
    1,543.96x = 2,315.94 × 389.72
  4. Step 4: Simplify right side
    1,543.96x = 902,568.14
  5. Step 5: Solve for x
    x = 902,568.14/1,543.96
  6. Step 6: Final answer
    x = 584.58

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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.