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Finding the Fourth Proportional to 936.48, 1,404.72 and 611.76

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Solution

The fourth proportional to 936.48, 1,404.72 and 611.76 is: 917.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.48 : 1,404.72 = 611.76 : x
  2. Step 2: Convert to fraction form
    936.48/1,404.72 = 611.76/x
  3. Step 3: Cross multiply
    936.48x = 1,404.72 × 611.76
  4. Step 4: Simplify right side
    936.48x = 859,351.51
  5. Step 5: Solve for x
    x = 859,351.51/936.48
  6. Step 6: Final answer
    x = 917.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.