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Finding the Fourth Proportional to 570.60, 786.24 and 439.20

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Solution

The fourth proportional to 570.60, 786.24 and 439.20 is: 605.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.60 : 786.24 = 439.20 : x
  2. Step 2: Convert to fraction form
    570.60/786.24 = 439.20/x
  3. Step 3: Cross multiply
    570.60x = 786.24 × 439.20
  4. Step 4: Simplify right side
    570.60x = 345,316.61
  5. Step 5: Solve for x
    x = 345,316.61/570.60
  6. Step 6: Final answer
    x = 605.18

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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.