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Finding the Fourth Proportional to 1,038.92, 1,557.42 and 389.16

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Solution

The fourth proportional to 1,038.92, 1,557.42 and 389.16 is: 583.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.92 : 1,557.42 = 389.16 : x
  2. Step 2: Convert to fraction form
    1,038.92/1,557.42 = 389.16/x
  3. Step 3: Cross multiply
    1,038.92x = 1,557.42 × 389.16
  4. Step 4: Simplify right side
    1,038.92x = 606,085.57
  5. Step 5: Solve for x
    x = 606,085.57/1,038.92
  6. Step 6: Final answer
    x = 583.38

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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.