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Finding the Fourth Proportional to 1,053.78, 1,579.82 and 938.45

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Solution

The fourth proportional to 1,053.78, 1,579.82 and 938.45 is: 1,406.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.78 : 1,579.82 = 938.45 : x
  2. Step 2: Convert to fraction form
    1,053.78/1,579.82 = 938.45/x
  3. Step 3: Cross multiply
    1,053.78x = 1,579.82 × 938.45
  4. Step 4: Simplify right side
    1,053.78x = 1,482,575.41
  5. Step 5: Solve for x
    x = 1,482,575.41/1,053.78
  6. Step 6: Final answer
    x = 1,406.91

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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.