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Finding the Fourth Proportional to 913.60, 1,260.80 and 520.56

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Solution

The fourth proportional to 913.60, 1,260.80 and 520.56 is: 718.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.60 : 1,260.80 = 520.56 : x
  2. Step 2: Convert to fraction form
    913.60/1,260.80 = 520.56/x
  3. Step 3: Cross multiply
    913.60x = 1,260.80 × 520.56
  4. Step 4: Simplify right side
    913.60x = 656,322.05
  5. Step 5: Solve for x
    x = 656,322.05/913.60
  6. Step 6: Final answer
    x = 718.39

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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.