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Finding the Fourth Proportional to 858.86, 1,185.20 and 480.75

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Solution

The fourth proportional to 858.86, 1,185.20 and 480.75 is: 663.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.86 : 1,185.20 = 480.75 : x
  2. Step 2: Convert to fraction form
    858.86/1,185.20 = 480.75/x
  3. Step 3: Cross multiply
    858.86x = 1,185.20 × 480.75
  4. Step 4: Simplify right side
    858.86x = 569,784.90
  5. Step 5: Solve for x
    x = 569,784.90/858.86
  6. Step 6: Final answer
    x = 663.42

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.