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Finding the Fourth Proportional to 858.85, 1,185.66 and 580.54

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Solution

The fourth proportional to 858.85, 1,185.66 and 580.54 is: 801.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.85 : 1,185.66 = 580.54 : x
  2. Step 2: Convert to fraction form
    858.85/1,185.66 = 580.54/x
  3. Step 3: Cross multiply
    858.85x = 1,185.66 × 580.54
  4. Step 4: Simplify right side
    858.85x = 688,323.06
  5. Step 5: Solve for x
    x = 688,323.06/858.85
  6. Step 6: Final answer
    x = 801.45

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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.