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Finding the Fourth Proportional to 1,520.80, 2,281.68 and 905.20

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Solution

The fourth proportional to 1,520.80, 2,281.68 and 905.20 is: 1,358.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.80 : 2,281.68 = 905.20 : x
  2. Step 2: Convert to fraction form
    1,520.80/2,281.68 = 905.20/x
  3. Step 3: Cross multiply
    1,520.80x = 2,281.68 × 905.20
  4. Step 4: Simplify right side
    1,520.80x = 2,065,376.74
  5. Step 5: Solve for x
    x = 2,065,376.74/1,520.80
  6. Step 6: Final answer
    x = 1,358.09

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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.