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Finding the Fourth Proportional to 858.76, 1,185.09 and 465.78

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Solution

The fourth proportional to 858.76, 1,185.09 and 465.78 is: 642.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.76 : 1,185.09 = 465.78 : x
  2. Step 2: Convert to fraction form
    858.76/1,185.09 = 465.78/x
  3. Step 3: Cross multiply
    858.76x = 1,185.09 × 465.78
  4. Step 4: Simplify right side
    858.76x = 551,991.22
  5. Step 5: Solve for x
    x = 551,991.22/858.76
  6. Step 6: Final answer
    x = 642.78

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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.