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Finding the Fourth Proportional to 1,110.45, 1,665.95 and 417.19

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Solution

The fourth proportional to 1,110.45, 1,665.95 and 417.19 is: 625.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.45 : 1,665.95 = 417.19 : x
  2. Step 2: Convert to fraction form
    1,110.45/1,665.95 = 417.19/x
  3. Step 3: Cross multiply
    1,110.45x = 1,665.95 × 417.19
  4. Step 4: Simplify right side
    1,110.45x = 695,017.68
  5. Step 5: Solve for x
    x = 695,017.68/1,110.45
  6. Step 6: Final answer
    x = 625.89

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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.