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Finding the Fourth Proportional to 579.84, 870.30 and 459.42

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Solution

The fourth proportional to 579.84, 870.30 and 459.42 is: 689.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.84 : 870.30 = 459.42 : x
  2. Step 2: Convert to fraction form
    579.84/870.30 = 459.42/x
  3. Step 3: Cross multiply
    579.84x = 870.30 × 459.42
  4. Step 4: Simplify right side
    579.84x = 399,833.23
  5. Step 5: Solve for x
    x = 399,833.23/579.84
  6. Step 6: Final answer
    x = 689.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.