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Finding the Fourth Proportional to 491.90, 737.98 and 145.22

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Solution

The fourth proportional to 491.90, 737.98 and 145.22 is: 217.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.90 : 737.98 = 145.22 : x
  2. Step 2: Convert to fraction form
    491.90/737.98 = 145.22/x
  3. Step 3: Cross multiply
    491.90x = 737.98 × 145.22
  4. Step 4: Simplify right side
    491.90x = 107,169.46
  5. Step 5: Solve for x
    x = 107,169.46/491.90
  6. Step 6: Final answer
    x = 217.87

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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.