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Finding the Fourth Proportional to 971.94, 1,341.57 and 661.62

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Solution

The fourth proportional to 971.94, 1,341.57 and 661.62 is: 913.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.94 : 1,341.57 = 661.62 : x
  2. Step 2: Convert to fraction form
    971.94/1,341.57 = 661.62/x
  3. Step 3: Cross multiply
    971.94x = 1,341.57 × 661.62
  4. Step 4: Simplify right side
    971.94x = 887,609.54
  5. Step 5: Solve for x
    x = 887,609.54/971.94
  6. Step 6: Final answer
    x = 913.23

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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.