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Finding the Fourth Proportional to 1,431.71, 2,147.05 and 651.05

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Solution

The fourth proportional to 1,431.71, 2,147.05 and 651.05 is: 976.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.71 : 2,147.05 = 651.05 : x
  2. Step 2: Convert to fraction form
    1,431.71/2,147.05 = 651.05/x
  3. Step 3: Cross multiply
    1,431.71x = 2,147.05 × 651.05
  4. Step 4: Simplify right side
    1,431.71x = 1,397,840.64
  5. Step 5: Solve for x
    x = 1,397,840.64/1,431.71
  6. Step 6: Final answer
    x = 976.35

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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.