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Finding the Fourth Proportional to 509.28, 766.80 and 448.80

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Solution

The fourth proportional to 509.28, 766.80 and 448.80 is: 675.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.28 : 766.80 = 448.80 : x
  2. Step 2: Convert to fraction form
    509.28/766.80 = 448.80/x
  3. Step 3: Cross multiply
    509.28x = 766.80 × 448.80
  4. Step 4: Simplify right side
    509.28x = 344,139.84
  5. Step 5: Solve for x
    x = 344,139.84/509.28
  6. Step 6: Final answer
    x = 675.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.