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Finding the Fourth Proportional to 505.68, 760.20 and 415.05

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Solution

The fourth proportional to 505.68, 760.20 and 415.05 is: 623.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.68 : 760.20 = 415.05 : x
  2. Step 2: Convert to fraction form
    505.68/760.20 = 415.05/x
  3. Step 3: Cross multiply
    505.68x = 760.20 × 415.05
  4. Step 4: Simplify right side
    505.68x = 315,521.01
  5. Step 5: Solve for x
    x = 315,521.01/505.68
  6. Step 6: Final answer
    x = 623.95

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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.