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Finding the Fourth Proportional to 1,038.74, 1,558.05 and 389.43

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Solution

The fourth proportional to 1,038.74, 1,558.05 and 389.43 is: 584.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.74 : 1,558.05 = 389.43 : x
  2. Step 2: Convert to fraction form
    1,038.74/1,558.05 = 389.43/x
  3. Step 3: Cross multiply
    1,038.74x = 1,558.05 × 389.43
  4. Step 4: Simplify right side
    1,038.74x = 606,751.41
  5. Step 5: Solve for x
    x = 606,751.41/1,038.74
  6. Step 6: Final answer
    x = 584.12

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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.