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Finding the Fourth Proportional to 478.81, 718.34 and 136.81

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Solution

The fourth proportional to 478.81, 718.34 and 136.81 is: 205.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.81 : 718.34 = 136.81 : x
  2. Step 2: Convert to fraction form
    478.81/718.34 = 136.81/x
  3. Step 3: Cross multiply
    478.81x = 718.34 × 136.81
  4. Step 4: Simplify right side
    478.81x = 98,277.89
  5. Step 5: Solve for x
    x = 98,277.89/478.81
  6. Step 6: Final answer
    x = 205.25

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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.