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Finding the Fourth Proportional to 855.72, 1,283.58 and 513

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Solution

The fourth proportional to 855.72, 1,283.58 and 513 is: 769.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.72 : 1,283.58 = 513 : x
  2. Step 2: Convert to fraction form
    855.72/1,283.58 = 513/x
  3. Step 3: Cross multiply
    855.72x = 1,283.58 × 513
  4. Step 4: Simplify right side
    855.72x = 658,476.54
  5. Step 5: Solve for x
    x = 658,476.54/855.72
  6. Step 6: Final answer
    x = 769.50

Related Problems

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Half scale
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Double scale
Find fourth proportional to 856.72, 1,285.08 and 514
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.