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Finding the Fourth Proportional to 520.08, 780.40 and 479.98

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Solution

The fourth proportional to 520.08, 780.40 and 479.98 is: 720.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.08 : 780.40 = 479.98 : x
  2. Step 2: Convert to fraction form
    520.08/780.40 = 479.98/x
  3. Step 3: Cross multiply
    520.08x = 780.40 × 479.98
  4. Step 4: Simplify right side
    520.08x = 374,576.39
  5. Step 5: Solve for x
    x = 374,576.39/520.08
  6. Step 6: Final answer
    x = 720.23

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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.