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Finding the Fourth Proportional to 760.20, 1,048.86 and 449.76

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Solution

The fourth proportional to 760.20, 1,048.86 and 449.76 is: 620.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.20 : 1,048.86 = 449.76 : x
  2. Step 2: Convert to fraction form
    760.20/1,048.86 = 449.76/x
  3. Step 3: Cross multiply
    760.20x = 1,048.86 × 449.76
  4. Step 4: Simplify right side
    760.20x = 471,735.27
  5. Step 5: Solve for x
    x = 471,735.27/760.20
  6. Step 6: Final answer
    x = 620.54

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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.