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Finding the Fourth Proportional to 1,276.66, 1,913.88 and 660.05

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Solution

The fourth proportional to 1,276.66, 1,913.88 and 660.05 is: 989.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.66 : 1,913.88 = 660.05 : x
  2. Step 2: Convert to fraction form
    1,276.66/1,913.88 = 660.05/x
  3. Step 3: Cross multiply
    1,276.66x = 1,913.88 × 660.05
  4. Step 4: Simplify right side
    1,276.66x = 1,263,252.86
  5. Step 5: Solve for x
    x = 1,263,252.86/1,276.66
  6. Step 6: Final answer
    x = 989.50

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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.