Home / 1,005.90-1,385.26-943.39

Finding the Fourth Proportional to 1,005.90, 1,385.26 and 943.39

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Solution

The fourth proportional to 1,005.90, 1,385.26 and 943.39 is: 1,299.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.90 : 1,385.26 = 943.39 : x
  2. Step 2: Convert to fraction form
    1,005.90/1,385.26 = 943.39/x
  3. Step 3: Cross multiply
    1,005.90x = 1,385.26 × 943.39
  4. Step 4: Simplify right side
    1,005.90x = 1,306,840.43
  5. Step 5: Solve for x
    x = 1,306,840.43/1,005.90
  6. Step 6: Final answer
    x = 1,299.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.