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Finding the Fourth Proportional to 920.76, 1,379.88 and 426.88

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Solution

The fourth proportional to 920.76, 1,379.88 and 426.88 is: 639.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.76 : 1,379.88 = 426.88 : x
  2. Step 2: Convert to fraction form
    920.76/1,379.88 = 426.88/x
  3. Step 3: Cross multiply
    920.76x = 1,379.88 × 426.88
  4. Step 4: Simplify right side
    920.76x = 589,043.17
  5. Step 5: Solve for x
    x = 589,043.17/920.76
  6. Step 6: Final answer
    x = 639.74

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1.5x scale

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.