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Finding the Fourth Proportional to 913.45, 1,260.56 and 499.45

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Solution

The fourth proportional to 913.45, 1,260.56 and 499.45 is: 689.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.45 : 1,260.56 = 499.45 : x
  2. Step 2: Convert to fraction form
    913.45/1,260.56 = 499.45/x
  3. Step 3: Cross multiply
    913.45x = 1,260.56 × 499.45
  4. Step 4: Simplify right side
    913.45x = 629,577.89
  5. Step 5: Solve for x
    x = 629,577.89/913.45
  6. Step 6: Final answer
    x = 689.23

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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.