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Finding the Fourth Proportional to 1,038.39, 1,557.04 and 490.42

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Solution

The fourth proportional to 1,038.39, 1,557.04 and 490.42 is: 735.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.39 : 1,557.04 = 490.42 : x
  2. Step 2: Convert to fraction form
    1,038.39/1,557.04 = 490.42/x
  3. Step 3: Cross multiply
    1,038.39x = 1,557.04 × 490.42
  4. Step 4: Simplify right side
    1,038.39x = 763,605.20
  5. Step 5: Solve for x
    x = 763,605.20/1,038.39
  6. Step 6: Final answer
    x = 735.38

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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.