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Finding the Fourth Proportional to 1,111.64, 1,666.30 and 381

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Solution

The fourth proportional to 1,111.64, 1,666.30 and 381 is: 571.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.64 : 1,666.30 = 381 : x
  2. Step 2: Convert to fraction form
    1,111.64/1,666.30 = 381/x
  3. Step 3: Cross multiply
    1,111.64x = 1,666.30 × 381
  4. Step 4: Simplify right side
    1,111.64x = 634,860.30
  5. Step 5: Solve for x
    x = 634,860.30/1,111.64
  6. Step 6: Final answer
    x = 571.10

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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.