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Finding the Fourth Proportional to 1,038.49, 1,557.68 and 389.17

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Solution

The fourth proportional to 1,038.49, 1,557.68 and 389.17 is: 583.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.49 : 1,557.68 = 389.17 : x
  2. Step 2: Convert to fraction form
    1,038.49/1,557.68 = 389.17/x
  3. Step 3: Cross multiply
    1,038.49x = 1,557.68 × 389.17
  4. Step 4: Simplify right side
    1,038.49x = 606,202.33
  5. Step 5: Solve for x
    x = 606,202.33/1,038.49
  6. Step 6: Final answer
    x = 583.73

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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.