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Finding the Fourth Proportional to 771.48, 1,155.54 and 481.50

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Solution

The fourth proportional to 771.48, 1,155.54 and 481.50 is: 721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.48 : 1,155.54 = 481.50 : x
  2. Step 2: Convert to fraction form
    771.48/1,155.54 = 481.50/x
  3. Step 3: Cross multiply
    771.48x = 1,155.54 × 481.50
  4. Step 4: Simplify right side
    771.48x = 556,392.51
  5. Step 5: Solve for x
    x = 556,392.51/771.48
  6. Step 6: Final answer
    x = 721.20

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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.