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Finding the Fourth Proportional to 520.28, 780.57 and 173.65

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Solution

The fourth proportional to 520.28, 780.57 and 173.65 is: 260.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.28 : 780.57 = 173.65 : x
  2. Step 2: Convert to fraction form
    520.28/780.57 = 173.65/x
  3. Step 3: Cross multiply
    520.28x = 780.57 × 173.65
  4. Step 4: Simplify right side
    520.28x = 135,544.03
  5. Step 5: Solve for x
    x = 135,544.03/520.28
  6. Step 6: Final answer
    x = 260.52

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Find fourth proportional to 260.14, 390.29 and 86.82
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Double scale
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Similar ratio
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1.5x scale

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.