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Finding the Fourth Proportional to 1,276.77, 1,913.49 and 926.55

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Solution

The fourth proportional to 1,276.77, 1,913.49 and 926.55 is: 1,388.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.77 : 1,913.49 = 926.55 : x
  2. Step 2: Convert to fraction form
    1,276.77/1,913.49 = 926.55/x
  3. Step 3: Cross multiply
    1,276.77x = 1,913.49 × 926.55
  4. Step 4: Simplify right side
    1,276.77x = 1,772,944.16
  5. Step 5: Solve for x
    x = 1,772,944.16/1,276.77
  6. Step 6: Final answer
    x = 1,388.62

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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.