Home / 1,312.29-1,968.55-338.39

Finding the Fourth Proportional to 1,312.29, 1,968.55 and 338.39

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Solution

The fourth proportional to 1,312.29, 1,968.55 and 338.39 is: 507.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.29 : 1,968.55 = 338.39 : x
  2. Step 2: Convert to fraction form
    1,312.29/1,968.55 = 338.39/x
  3. Step 3: Cross multiply
    1,312.29x = 1,968.55 × 338.39
  4. Step 4: Simplify right side
    1,312.29x = 666,137.63
  5. Step 5: Solve for x
    x = 666,137.63/1,312.29
  6. Step 6: Final answer
    x = 507.61

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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.