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Finding the Fourth Proportional to 1,111.13, 1,666.89 and 418.27

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Solution

The fourth proportional to 1,111.13, 1,666.89 and 418.27 is: 627.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.13 : 1,666.89 = 418.27 : x
  2. Step 2: Convert to fraction form
    1,111.13/1,666.89 = 418.27/x
  3. Step 3: Cross multiply
    1,111.13x = 1,666.89 × 418.27
  4. Step 4: Simplify right side
    1,111.13x = 697,210.08
  5. Step 5: Solve for x
    x = 697,210.08/1,111.13
  6. Step 6: Final answer
    x = 627.48

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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.