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Finding the Fourth Proportional to 518.68, 778.16 and 302.40

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Solution

The fourth proportional to 518.68, 778.16 and 302.40 is: 453.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.68 : 778.16 = 302.40 : x
  2. Step 2: Convert to fraction form
    518.68/778.16 = 302.40/x
  3. Step 3: Cross multiply
    518.68x = 778.16 × 302.40
  4. Step 4: Simplify right side
    518.68x = 235,315.58
  5. Step 5: Solve for x
    x = 235,315.58/518.68
  6. Step 6: Final answer
    x = 453.68

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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.