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Finding the Fourth Proportional to 936.40, 1,291.94 and 543.38

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Solution

The fourth proportional to 936.40, 1,291.94 and 543.38 is: 749.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.40 : 1,291.94 = 543.38 : x
  2. Step 2: Convert to fraction form
    936.40/1,291.94 = 543.38/x
  3. Step 3: Cross multiply
    936.40x = 1,291.94 × 543.38
  4. Step 4: Simplify right side
    936.40x = 702,014.36
  5. Step 5: Solve for x
    x = 702,014.36/936.40
  6. Step 6: Final answer
    x = 749.69

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1.5x scale

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.