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Finding the Fourth Proportional to 1,312.30, 1,967.94 and 490.39

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Solution

The fourth proportional to 1,312.30, 1,967.94 and 490.39 is: 735.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.30 : 1,967.94 = 490.39 : x
  2. Step 2: Convert to fraction form
    1,312.30/1,967.94 = 490.39/x
  3. Step 3: Cross multiply
    1,312.30x = 1,967.94 × 490.39
  4. Step 4: Simplify right side
    1,312.30x = 965,053.18
  5. Step 5: Solve for x
    x = 965,053.18/1,312.30
  6. Step 6: Final answer
    x = 735.39

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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.