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Finding the Fourth Proportional to 1,078.33, 1,618.08 and 429.07

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Solution

The fourth proportional to 1,078.33, 1,618.08 and 429.07 is: 643.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.33 : 1,618.08 = 429.07 : x
  2. Step 2: Convert to fraction form
    1,078.33/1,618.08 = 429.07/x
  3. Step 3: Cross multiply
    1,078.33x = 1,618.08 × 429.07
  4. Step 4: Simplify right side
    1,078.33x = 694,269.59
  5. Step 5: Solve for x
    x = 694,269.59/1,078.33
  6. Step 6: Final answer
    x = 643.84

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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.