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Finding the Fourth Proportional to 890.97, 1,341.63 and 661.47

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Solution

The fourth proportional to 890.97, 1,341.63 and 661.47 is: 996.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.97 : 1,341.63 = 661.47 : x
  2. Step 2: Convert to fraction form
    890.97/1,341.63 = 661.47/x
  3. Step 3: Cross multiply
    890.97x = 1,341.63 × 661.47
  4. Step 4: Simplify right side
    890.97x = 887,448.00
  5. Step 5: Solve for x
    x = 887,448.00/890.97
  6. Step 6: Final answer
    x = 996.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.