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Finding the Fourth Proportional to 913.80, 1,260.52 and 520.75

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Solution

The fourth proportional to 913.80, 1,260.52 and 520.75 is: 718.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.80 : 1,260.52 = 520.75 : x
  2. Step 2: Convert to fraction form
    913.80/1,260.52 = 520.75/x
  3. Step 3: Cross multiply
    913.80x = 1,260.52 × 520.75
  4. Step 4: Simplify right side
    913.80x = 656,415.79
  5. Step 5: Solve for x
    x = 656,415.79/913.80
  6. Step 6: Final answer
    x = 718.34

Related Problems

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Half scale
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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.