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Finding the Fourth Proportional to 1,258.62, 1,885.77 and 999.42

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Solution

The fourth proportional to 1,258.62, 1,885.77 and 999.42 is: 1,497.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.62 : 1,885.77 = 999.42 : x
  2. Step 2: Convert to fraction form
    1,258.62/1,885.77 = 999.42/x
  3. Step 3: Cross multiply
    1,258.62x = 1,885.77 × 999.42
  4. Step 4: Simplify right side
    1,258.62x = 1,884,676.25
  5. Step 5: Solve for x
    x = 1,884,676.25/1,258.62
  6. Step 6: Final answer
    x = 1,497.41

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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.