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Finding the Fourth Proportional to 570.39, 857.21 and 339.35

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Solution

The fourth proportional to 570.39, 857.21 and 339.35 is: 509.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.39 : 857.21 = 339.35 : x
  2. Step 2: Convert to fraction form
    570.39/857.21 = 339.35/x
  3. Step 3: Cross multiply
    570.39x = 857.21 × 339.35
  4. Step 4: Simplify right side
    570.39x = 290,888.23
  5. Step 5: Solve for x
    x = 290,888.23/570.39
  6. Step 6: Final answer
    x = 509.98

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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.