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Finding the Fourth Proportional to 520.49, 780.73 and 289.32

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Solution

The fourth proportional to 520.49, 780.73 and 289.32 is: 433.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.49 : 780.73 = 289.32 : x
  2. Step 2: Convert to fraction form
    520.49/780.73 = 289.32/x
  3. Step 3: Cross multiply
    520.49x = 780.73 × 289.32
  4. Step 4: Simplify right side
    520.49x = 225,880.80
  5. Step 5: Solve for x
    x = 225,880.80/520.49
  6. Step 6: Final answer
    x = 433.98

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Double scale
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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.