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Finding the Fourth Proportional to 1,313.05, 1,969.65 and 339.15

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Solution

The fourth proportional to 1,313.05, 1,969.65 and 339.15 is: 508.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.05 : 1,969.65 = 339.15 : x
  2. Step 2: Convert to fraction form
    1,313.05/1,969.65 = 339.15/x
  3. Step 3: Cross multiply
    1,313.05x = 1,969.65 × 339.15
  4. Step 4: Simplify right side
    1,313.05x = 668,006.80
  5. Step 5: Solve for x
    x = 668,006.80/1,313.05
  6. Step 6: Final answer
    x = 508.74

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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.