Home / 1,137.18-1,569.28-639.92

Finding the Fourth Proportional to 1,137.18, 1,569.28 and 639.92

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Solution

The fourth proportional to 1,137.18, 1,569.28 and 639.92 is: 883.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.18 : 1,569.28 = 639.92 : x
  2. Step 2: Convert to fraction form
    1,137.18/1,569.28 = 639.92/x
  3. Step 3: Cross multiply
    1,137.18x = 1,569.28 × 639.92
  4. Step 4: Simplify right side
    1,137.18x = 1,004,213.66
  5. Step 5: Solve for x
    x = 1,004,213.66/1,137.18
  6. Step 6: Final answer
    x = 883.07

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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.