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Finding the Fourth Proportional to 1,032.90, 1,424.80 and 639.64

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Solution

The fourth proportional to 1,032.90, 1,424.80 and 639.64 is: 882.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,032.90 : 1,424.80 = 639.64 : x
  2. Step 2: Convert to fraction form
    1,032.90/1,424.80 = 639.64/x
  3. Step 3: Cross multiply
    1,032.90x = 1,424.80 × 639.64
  4. Step 4: Simplify right side
    1,032.90x = 911,355.87
  5. Step 5: Solve for x
    x = 911,355.87/1,032.90
  6. Step 6: Final answer
    x = 882.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.