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Finding the Fourth Proportional to 1,038.39, 1,557.42 and 388.98

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Solution

The fourth proportional to 1,038.39, 1,557.42 and 388.98 is: 583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.39 : 1,557.42 = 388.98 : x
  2. Step 2: Convert to fraction form
    1,038.39/1,557.42 = 388.98/x
  3. Step 3: Cross multiply
    1,038.39x = 1,557.42 × 388.98
  4. Step 4: Simplify right side
    1,038.39x = 605,805.23
  5. Step 5: Solve for x
    x = 605,805.23/1,038.39
  6. Step 6: Final answer
    x = 583.41

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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.