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Finding the Fourth Proportional to 939.76, 1,410.08 and 419.71

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Solution

The fourth proportional to 939.76, 1,410.08 and 419.71 is: 629.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.76 : 1,410.08 = 419.71 : x
  2. Step 2: Convert to fraction form
    939.76/1,410.08 = 419.71/x
  3. Step 3: Cross multiply
    939.76x = 1,410.08 × 419.71
  4. Step 4: Simplify right side
    939.76x = 591,823.63
  5. Step 5: Solve for x
    x = 591,823.63/939.76
  6. Step 6: Final answer
    x = 629.76

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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.