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Finding the Fourth Proportional to 1,287.60, 1,931.04 and 629.28

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Solution

The fourth proportional to 1,287.60, 1,931.04 and 629.28 is: 943.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.60 : 1,931.04 = 629.28 : x
  2. Step 2: Convert to fraction form
    1,287.60/1,931.04 = 629.28/x
  3. Step 3: Cross multiply
    1,287.60x = 1,931.04 × 629.28
  4. Step 4: Simplify right side
    1,287.60x = 1,215,164.85
  5. Step 5: Solve for x
    x = 1,215,164.85/1,287.60
  6. Step 6: Final answer
    x = 943.74

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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.