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Finding the Fourth Proportional to 1,078.16, 1,617.54 and 429.35

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Solution

The fourth proportional to 1,078.16, 1,617.54 and 429.35 is: 644.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.16 : 1,617.54 = 429.35 : x
  2. Step 2: Convert to fraction form
    1,078.16/1,617.54 = 429.35/x
  3. Step 3: Cross multiply
    1,078.16x = 1,617.54 × 429.35
  4. Step 4: Simplify right side
    1,078.16x = 694,493.82
  5. Step 5: Solve for x
    x = 694,493.82/1,078.16
  6. Step 6: Final answer
    x = 644.15

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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.