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Finding the Fourth Proportional to 1,043.88, 1,421.28 and 1,040.64

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Solution

The fourth proportional to 1,043.88, 1,421.28 and 1,040.64 is: 1,416.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.88 : 1,421.28 = 1,040.64 : x
  2. Step 2: Convert to fraction form
    1,043.88/1,421.28 = 1,040.64/x
  3. Step 3: Cross multiply
    1,043.88x = 1,421.28 × 1,040.64
  4. Step 4: Simplify right side
    1,043.88x = 1,479,040.82
  5. Step 5: Solve for x
    x = 1,479,040.82/1,043.88
  6. Step 6: Final answer
    x = 1,416.87

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.