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Finding the Fourth Proportional to 941.90, 1,298.45 and 661.29

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Solution

The fourth proportional to 941.90, 1,298.45 and 661.29 is: 911.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.90 : 1,298.45 = 661.29 : x
  2. Step 2: Convert to fraction form
    941.90/1,298.45 = 661.29/x
  3. Step 3: Cross multiply
    941.90x = 1,298.45 × 661.29
  4. Step 4: Simplify right side
    941.90x = 858,652.00
  5. Step 5: Solve for x
    x = 858,652.00/941.90
  6. Step 6: Final answer
    x = 911.62

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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.