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Finding the Fourth Proportional to 1,029.60, 1,420.56 and 679.68

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Solution

The fourth proportional to 1,029.60, 1,420.56 and 679.68 is: 937.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.60 : 1,420.56 = 679.68 : x
  2. Step 2: Convert to fraction form
    1,029.60/1,420.56 = 679.68/x
  3. Step 3: Cross multiply
    1,029.60x = 1,420.56 × 679.68
  4. Step 4: Simplify right side
    1,029.60x = 965,526.22
  5. Step 5: Solve for x
    x = 965,526.22/1,029.60
  6. Step 6: Final answer
    x = 937.77

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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.