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Finding the Fourth Proportional to 1,039.49, 1,559.64 and 309.08

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Solution

The fourth proportional to 1,039.49, 1,559.64 and 309.08 is: 463.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.49 : 1,559.64 = 309.08 : x
  2. Step 2: Convert to fraction form
    1,039.49/1,559.64 = 309.08/x
  3. Step 3: Cross multiply
    1,039.49x = 1,559.64 × 309.08
  4. Step 4: Simplify right side
    1,039.49x = 482,045.73
  5. Step 5: Solve for x
    x = 482,045.73/1,039.49
  6. Step 6: Final answer
    x = 463.74

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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.