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Finding the Fourth Proportional to 858.89, 1,185.05 and 579.63

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Solution

The fourth proportional to 858.89, 1,185.05 and 579.63 is: 799.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.89 : 1,185.05 = 579.63 : x
  2. Step 2: Convert to fraction form
    858.89/1,185.05 = 579.63/x
  3. Step 3: Cross multiply
    858.89x = 1,185.05 × 579.63
  4. Step 4: Simplify right side
    858.89x = 686,887.63
  5. Step 5: Solve for x
    x = 686,887.63/858.89
  6. Step 6: Final answer
    x = 799.74

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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.