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Finding the Fourth Proportional to 913.21, 1,260.23 and 520.23

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Solution

The fourth proportional to 913.21, 1,260.23 and 520.23 is: 717.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.21 : 1,260.23 = 520.23 : x
  2. Step 2: Convert to fraction form
    913.21/1,260.23 = 520.23/x
  3. Step 3: Cross multiply
    913.21x = 1,260.23 × 520.23
  4. Step 4: Simplify right side
    913.21x = 655,609.45
  5. Step 5: Solve for x
    x = 655,609.45/913.21
  6. Step 6: Final answer
    x = 717.92

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Double scale
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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.