Home / 1,042.66-1,431.20-921.99

Finding the Fourth Proportional to 1,042.66, 1,431.20 and 921.99

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Solution

The fourth proportional to 1,042.66, 1,431.20 and 921.99 is: 1,265.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.66 : 1,431.20 = 921.99 : x
  2. Step 2: Convert to fraction form
    1,042.66/1,431.20 = 921.99/x
  3. Step 3: Cross multiply
    1,042.66x = 1,431.20 × 921.99
  4. Step 4: Simplify right side
    1,042.66x = 1,319,545.09
  5. Step 5: Solve for x
    x = 1,319,545.09/1,042.66
  6. Step 6: Final answer
    x = 1,265.56

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.