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Finding the Fourth Proportional to 941.91, 1,298.61 and 720.51

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Solution

The fourth proportional to 941.91, 1,298.61 and 720.51 is: 993.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.91 : 1,298.61 = 720.51 : x
  2. Step 2: Convert to fraction form
    941.91/1,298.61 = 720.51/x
  3. Step 3: Cross multiply
    941.91x = 1,298.61 × 720.51
  4. Step 4: Simplify right side
    941.91x = 935,661.49
  5. Step 5: Solve for x
    x = 935,661.49/941.91
  6. Step 6: Final answer
    x = 993.37

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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.