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Finding the Fourth Proportional to 1,078.84, 1,618.26 and 429.58

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Solution

The fourth proportional to 1,078.84, 1,618.26 and 429.58 is: 644.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.84 : 1,618.26 = 429.58 : x
  2. Step 2: Convert to fraction form
    1,078.84/1,618.26 = 429.58/x
  3. Step 3: Cross multiply
    1,078.84x = 1,618.26 × 429.58
  4. Step 4: Simplify right side
    1,078.84x = 695,172.13
  5. Step 5: Solve for x
    x = 695,172.13/1,078.84
  6. Step 6: Final answer
    x = 644.37

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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.