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Finding the Fourth Proportional to 1,257.92, 1,734.72 and 977.75

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Solution

The fourth proportional to 1,257.92, 1,734.72 and 977.75 is: 1,348.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.92 : 1,734.72 = 977.75 : x
  2. Step 2: Convert to fraction form
    1,257.92/1,734.72 = 977.75/x
  3. Step 3: Cross multiply
    1,257.92x = 1,734.72 × 977.75
  4. Step 4: Simplify right side
    1,257.92x = 1,696,122.48
  5. Step 5: Solve for x
    x = 1,696,122.48/1,257.92
  6. Step 6: Final answer
    x = 1,348.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.