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Finding the Fourth Proportional to 945.91, 1,305.55 and 553.03

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Solution

The fourth proportional to 945.91, 1,305.55 and 553.03 is: 763.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.91 : 1,305.55 = 553.03 : x
  2. Step 2: Convert to fraction form
    945.91/1,305.55 = 553.03/x
  3. Step 3: Cross multiply
    945.91x = 1,305.55 × 553.03
  4. Step 4: Simplify right side
    945.91x = 722,005.74
  5. Step 5: Solve for x
    x = 722,005.74/945.91
  6. Step 6: Final answer
    x = 763.29

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Double scale
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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.