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Finding the Fourth Proportional to 1,111.15, 1,666.95 and 380.76

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Solution

The fourth proportional to 1,111.15, 1,666.95 and 380.76 is: 571.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.15 : 1,666.95 = 380.76 : x
  2. Step 2: Convert to fraction form
    1,111.15/1,666.95 = 380.76/x
  3. Step 3: Cross multiply
    1,111.15x = 1,666.95 × 380.76
  4. Step 4: Simplify right side
    1,111.15x = 634,707.88
  5. Step 5: Solve for x
    x = 634,707.88/1,111.15
  6. Step 6: Final answer
    x = 571.22

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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.