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Finding the Fourth Proportional to 1,543.72, 2,315.66 and 389.48

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Solution

The fourth proportional to 1,543.72, 2,315.66 and 389.48 is: 584.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.72 : 2,315.66 = 389.48 : x
  2. Step 2: Convert to fraction form
    1,543.72/2,315.66 = 389.48/x
  3. Step 3: Cross multiply
    1,543.72x = 2,315.66 × 389.48
  4. Step 4: Simplify right side
    1,543.72x = 901,903.26
  5. Step 5: Solve for x
    x = 901,903.26/1,543.72
  6. Step 6: Final answer
    x = 584.24

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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.