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Finding the Fourth Proportional to 858.76, 1,183.86 and 579.16

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Solution

The fourth proportional to 858.76, 1,183.86 and 579.16 is: 798.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.76 : 1,183.86 = 579.16 : x
  2. Step 2: Convert to fraction form
    858.76/1,183.86 = 579.16/x
  3. Step 3: Cross multiply
    858.76x = 1,183.86 × 579.16
  4. Step 4: Simplify right side
    858.76x = 685,644.36
  5. Step 5: Solve for x
    x = 685,644.36/858.76
  6. Step 6: Final answer
    x = 798.41

Related Problems

Find fourth proportional to 429.38, 591.93 and 289.58
Half scale
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Double scale
Find fourth proportional to 859.76, 1,185.24 and 580.16
Similar ratio
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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.