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Finding the Fourth Proportional to 1,039.40, 1,558.58 and 345.82

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Solution

The fourth proportional to 1,039.40, 1,558.58 and 345.82 is: 518.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.40 : 1,558.58 = 345.82 : x
  2. Step 2: Convert to fraction form
    1,039.40/1,558.58 = 345.82/x
  3. Step 3: Cross multiply
    1,039.40x = 1,558.58 × 345.82
  4. Step 4: Simplify right side
    1,039.40x = 538,988.35
  5. Step 5: Solve for x
    x = 538,988.35/1,039.40
  6. Step 6: Final answer
    x = 518.56

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