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Finding the Fourth Proportional to 913.63, 1,260.81 and 499.63

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Solution

The fourth proportional to 913.63, 1,260.81 and 499.63 is: 689.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.63 : 1,260.81 = 499.63 : x
  2. Step 2: Convert to fraction form
    913.63/1,260.81 = 499.63/x
  3. Step 3: Cross multiply
    913.63x = 1,260.81 × 499.63
  4. Step 4: Simplify right side
    913.63x = 629,929.70
  5. Step 5: Solve for x
    x = 629,929.70/913.63
  6. Step 6: Final answer
    x = 689.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.