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Finding the Fourth Proportional to 1,520.95, 2,279.40 and 654.25

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Solution

The fourth proportional to 1,520.95, 2,279.40 and 654.25 is: 980.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.95 : 2,279.40 = 654.25 : x
  2. Step 2: Convert to fraction form
    1,520.95/2,279.40 = 654.25/x
  3. Step 3: Cross multiply
    1,520.95x = 2,279.40 × 654.25
  4. Step 4: Simplify right side
    1,520.95x = 1,491,297.45
  5. Step 5: Solve for x
    x = 1,491,297.45/1,520.95
  6. Step 6: Final answer
    x = 980.50

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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.