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Finding the Fourth Proportional to 1,418.76, 1,956.60 and 920.88

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Solution

The fourth proportional to 1,418.76, 1,956.60 and 920.88 is: 1,269.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.76 : 1,956.60 = 920.88 : x
  2. Step 2: Convert to fraction form
    1,418.76/1,956.60 = 920.88/x
  3. Step 3: Cross multiply
    1,418.76x = 1,956.60 × 920.88
  4. Step 4: Simplify right side
    1,418.76x = 1,801,793.81
  5. Step 5: Solve for x
    x = 1,801,793.81/1,418.76
  6. Step 6: Final answer
    x = 1,269.98

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1.5x scale

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.