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Finding the Fourth Proportional to 879.36, 1,316.64 and 661.92

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Solution

The fourth proportional to 879.36, 1,316.64 and 661.92 is: 991.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.36 : 1,316.64 = 661.92 : x
  2. Step 2: Convert to fraction form
    879.36/1,316.64 = 661.92/x
  3. Step 3: Cross multiply
    879.36x = 1,316.64 × 661.92
  4. Step 4: Simplify right side
    879.36x = 871,510.35
  5. Step 5: Solve for x
    x = 871,510.35/879.36
  6. Step 6: Final answer
    x = 991.07

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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.