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Finding the Fourth Proportional to 1,258.67, 1,885.17 and 642.80

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Solution

The fourth proportional to 1,258.67, 1,885.17 and 642.80 is: 962.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.67 : 1,885.17 = 642.80 : x
  2. Step 2: Convert to fraction form
    1,258.67/1,885.17 = 642.80/x
  3. Step 3: Cross multiply
    1,258.67x = 1,885.17 × 642.80
  4. Step 4: Simplify right side
    1,258.67x = 1,211,787.28
  5. Step 5: Solve for x
    x = 1,211,787.28/1,258.67
  6. Step 6: Final answer
    x = 962.75

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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.