Home / 1,031.28-1,422.48-637.89

Finding the Fourth Proportional to 1,031.28, 1,422.48 and 637.89

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Solution

The fourth proportional to 1,031.28, 1,422.48 and 637.89 is: 879.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.28 : 1,422.48 = 637.89 : x
  2. Step 2: Convert to fraction form
    1,031.28/1,422.48 = 637.89/x
  3. Step 3: Cross multiply
    1,031.28x = 1,422.48 × 637.89
  4. Step 4: Simplify right side
    1,031.28x = 907,385.77
  5. Step 5: Solve for x
    x = 907,385.77/1,031.28
  6. Step 6: Final answer
    x = 879.86

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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.