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Finding the Fourth Proportional to 1,447.66, 2,171.40 and 474.40

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Solution

The fourth proportional to 1,447.66, 2,171.40 and 474.40 is: 711.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.66 : 2,171.40 = 474.40 : x
  2. Step 2: Convert to fraction form
    1,447.66/2,171.40 = 474.40/x
  3. Step 3: Cross multiply
    1,447.66x = 2,171.40 × 474.40
  4. Step 4: Simplify right side
    1,447.66x = 1,030,112.16
  5. Step 5: Solve for x
    x = 1,030,112.16/1,447.66
  6. Step 6: Final answer
    x = 711.57

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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.