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Finding the Fourth Proportional to 1,363.47, 2,045.30 and 389.58

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Solution

The fourth proportional to 1,363.47, 2,045.30 and 389.58 is: 584.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,363.47 : 2,045.30 = 389.58 : x
  2. Step 2: Convert to fraction form
    1,363.47/2,045.30 = 389.58/x
  3. Step 3: Cross multiply
    1,363.47x = 2,045.30 × 389.58
  4. Step 4: Simplify right side
    1,363.47x = 796,806.03
  5. Step 5: Solve for x
    x = 796,806.03/1,363.47
  6. Step 6: Final answer
    x = 584.40

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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.