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Finding the Fourth Proportional to 478.79, 718.40 and 262.12

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Solution

The fourth proportional to 478.79, 718.40 and 262.12 is: 393.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.79 : 718.40 = 262.12 : x
  2. Step 2: Convert to fraction form
    478.79/718.40 = 262.12/x
  3. Step 3: Cross multiply
    478.79x = 718.40 × 262.12
  4. Step 4: Simplify right side
    478.79x = 188,303.90
  5. Step 5: Solve for x
    x = 188,303.90/478.79
  6. Step 6: Final answer
    x = 393.29

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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.