Home / 1,128.43-1,557.32-631.09

Finding the Fourth Proportional to 1,128.43, 1,557.32 and 631.09

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Solution

The fourth proportional to 1,128.43, 1,557.32 and 631.09 is: 870.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.43 : 1,557.32 = 631.09 : x
  2. Step 2: Convert to fraction form
    1,128.43/1,557.32 = 631.09/x
  3. Step 3: Cross multiply
    1,128.43x = 1,557.32 × 631.09
  4. Step 4: Simplify right side
    1,128.43x = 982,809.08
  5. Step 5: Solve for x
    x = 982,809.08/1,128.43
  6. Step 6: Final answer
    x = 870.95

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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.