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Finding the Fourth Proportional to 579.42, 873.19 and 521.70

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Solution

The fourth proportional to 579.42, 873.19 and 521.70 is: 786.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.42 : 873.19 = 521.70 : x
  2. Step 2: Convert to fraction form
    579.42/873.19 = 521.70/x
  3. Step 3: Cross multiply
    579.42x = 873.19 × 521.70
  4. Step 4: Simplify right side
    579.42x = 455,543.22
  5. Step 5: Solve for x
    x = 455,543.22/579.42
  6. Step 6: Final answer
    x = 786.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.