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Finding the Fourth Proportional to 1,275.43, 1,908.59 and 999.63

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Solution

The fourth proportional to 1,275.43, 1,908.59 and 999.63 is: 1,495.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.43 : 1,908.59 = 999.63 : x
  2. Step 2: Convert to fraction form
    1,275.43/1,908.59 = 999.63/x
  3. Step 3: Cross multiply
    1,275.43x = 1,908.59 × 999.63
  4. Step 4: Simplify right side
    1,275.43x = 1,907,869.28
  5. Step 5: Solve for x
    x = 1,907,869.28/1,275.43
  6. Step 6: Final answer
    x = 1,495.86

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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.