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Finding the Fourth Proportional to 1,274.76, 1,911.62 and 864.02

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Solution

The fourth proportional to 1,274.76, 1,911.62 and 864.02 is: 1,295.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.76 : 1,911.62 = 864.02 : x
  2. Step 2: Convert to fraction form
    1,274.76/1,911.62 = 864.02/x
  3. Step 3: Cross multiply
    1,274.76x = 1,911.62 × 864.02
  4. Step 4: Simplify right side
    1,274.76x = 1,651,677.91
  5. Step 5: Solve for x
    x = 1,651,677.91/1,274.76
  6. Step 6: Final answer
    x = 1,295.68

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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.