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Finding the Fourth Proportional to 1,491.60, 2,238.60 and 761.64

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Solution

The fourth proportional to 1,491.60, 2,238.60 and 761.64 is: 1,143.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.60 : 2,238.60 = 761.64 : x
  2. Step 2: Convert to fraction form
    1,491.60/2,238.60 = 761.64/x
  3. Step 3: Cross multiply
    1,491.60x = 2,238.60 × 761.64
  4. Step 4: Simplify right side
    1,491.60x = 1,705,007.30
  5. Step 5: Solve for x
    x = 1,705,007.30/1,491.60
  6. Step 6: Final answer
    x = 1,143.07

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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.