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Finding the Fourth Proportional to 855.15, 1,180.05 and 482.19

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Solution

The fourth proportional to 855.15, 1,180.05 and 482.19 is: 665.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.15 : 1,180.05 = 482.19 : x
  2. Step 2: Convert to fraction form
    855.15/1,180.05 = 482.19/x
  3. Step 3: Cross multiply
    855.15x = 1,180.05 × 482.19
  4. Step 4: Simplify right side
    855.15x = 569,008.31
  5. Step 5: Solve for x
    x = 569,008.31/855.15
  6. Step 6: Final answer
    x = 665.39

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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.