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Finding the Fourth Proportional to 1,332.88, 1,992.74 and 1,129.72

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Solution

The fourth proportional to 1,332.88, 1,992.74 and 1,129.72 is: 1,689.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.88 : 1,992.74 = 1,129.72 : x
  2. Step 2: Convert to fraction form
    1,332.88/1,992.74 = 1,129.72/x
  3. Step 3: Cross multiply
    1,332.88x = 1,992.74 × 1,129.72
  4. Step 4: Simplify right side
    1,332.88x = 2,251,238.23
  5. Step 5: Solve for x
    x = 2,251,238.23/1,332.88
  6. Step 6: Final answer
    x = 1,689.00

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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.