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Finding the Fourth Proportional to 1,431.12, 2,145.04 and 660

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Solution

The fourth proportional to 1,431.12, 2,145.04 and 660 is: 989.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.12 : 2,145.04 = 660 : x
  2. Step 2: Convert to fraction form
    1,431.12/2,145.04 = 660/x
  3. Step 3: Cross multiply
    1,431.12x = 2,145.04 × 660
  4. Step 4: Simplify right side
    1,431.12x = 1,415,726.40
  5. Step 5: Solve for x
    x = 1,415,726.40/1,431.12
  6. Step 6: Final answer
    x = 989.24

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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.