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Finding the Fourth Proportional to 2,128.36, 3,192.44 and 647.53

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Solution

The fourth proportional to 2,128.36, 3,192.44 and 647.53 is: 971.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.36 : 3,192.44 = 647.53 : x
  2. Step 2: Convert to fraction form
    2,128.36/3,192.44 = 647.53/x
  3. Step 3: Cross multiply
    2,128.36x = 3,192.44 × 647.53
  4. Step 4: Simplify right side
    2,128.36x = 2,067,200.67
  5. Step 5: Solve for x
    x = 2,067,200.67/2,128.36
  6. Step 6: Final answer
    x = 971.26

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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.