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Finding the Fourth Proportional to 491.28, 735.70 and 285.18

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Solution

The fourth proportional to 491.28, 735.70 and 285.18 is: 427.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.28 : 735.70 = 285.18 : x
  2. Step 2: Convert to fraction form
    491.28/735.70 = 285.18/x
  3. Step 3: Cross multiply
    491.28x = 735.70 × 285.18
  4. Step 4: Simplify right side
    491.28x = 209,806.93
  5. Step 5: Solve for x
    x = 209,806.93/491.28
  6. Step 6: Final answer
    x = 427.06

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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.