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Finding the Fourth Proportional to 1,091,243.76, 1,505,992 and 661,542

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Solution

The fourth proportional to 1,091,243.76, 1,505,992 and 661,542 is: 912,973.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091,243.76 : 1,505,992 = 661,542 : x
  2. Step 2: Convert to fraction form
    1,091,243.76/1,505,992 = 661,542/x
  3. Step 3: Cross multiply
    1,091,243.76x = 1,505,992 × 661,542
  4. Step 4: Simplify right side
    1,091,243.76x = 996,276,959,664
  5. Step 5: Solve for x
    x = 996,276,959,664/1,091,243.76
  6. Step 6: Final answer
    x = 912,973.80

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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.