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Finding the Fourth Proportional to 704.60, 1,057.39 and 339.63

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Solution

The fourth proportional to 704.60, 1,057.39 and 339.63 is: 509.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.60 : 1,057.39 = 339.63 : x
  2. Step 2: Convert to fraction form
    704.60/1,057.39 = 339.63/x
  3. Step 3: Cross multiply
    704.60x = 1,057.39 × 339.63
  4. Step 4: Simplify right side
    704.60x = 359,116.55
  5. Step 5: Solve for x
    x = 359,116.55/704.60
  6. Step 6: Final answer
    x = 509.68

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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.