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Finding the Fourth Proportional to 1,328.02, 1,992.64 and 840.80

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Solution

The fourth proportional to 1,328.02, 1,992.64 and 840.80 is: 1,261.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.02 : 1,992.64 = 840.80 : x
  2. Step 2: Convert to fraction form
    1,328.02/1,992.64 = 840.80/x
  3. Step 3: Cross multiply
    1,328.02x = 1,992.64 × 840.80
  4. Step 4: Simplify right side
    1,328.02x = 1,675,411.71
  5. Step 5: Solve for x
    x = 1,675,411.71/1,328.02
  6. Step 6: Final answer
    x = 1,261.59

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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.