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Finding the Fourth Proportional to 1,232, 1,699.65 and 812.82

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Solution

The fourth proportional to 1,232, 1,699.65 and 812.82 is: 1,121.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,232 : 1,699.65 = 812.82 : x
  2. Step 2: Convert to fraction form
    1,232/1,699.65 = 812.82/x
  3. Step 3: Cross multiply
    1,232x = 1,699.65 × 812.82
  4. Step 4: Simplify right side
    1,232x = 1,381,509.51
  5. Step 5: Solve for x
    x = 1,381,509.51/1,232
  6. Step 6: Final answer
    x = 1,121.36

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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.