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Finding the Fourth Proportional to 913.56, 1,260.72 and 499.56

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Solution

The fourth proportional to 913.56, 1,260.72 and 499.56 is: 689.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.56 : 1,260.72 = 499.56 : x
  2. Step 2: Convert to fraction form
    913.56/1,260.72 = 499.56/x
  3. Step 3: Cross multiply
    913.56x = 1,260.72 × 499.56
  4. Step 4: Simplify right side
    913.56x = 629,805.28
  5. Step 5: Solve for x
    x = 629,805.28/913.56
  6. Step 6: Final answer
    x = 689.40

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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.