Home / 1,128.41-1,557.26-631.05

Finding the Fourth Proportional to 1,128.41, 1,557.26 and 631.05

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Solution

The fourth proportional to 1,128.41, 1,557.26 and 631.05 is: 870.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.41 : 1,557.26 = 631.05 : x
  2. Step 2: Convert to fraction form
    1,128.41/1,557.26 = 631.05/x
  3. Step 3: Cross multiply
    1,128.41x = 1,557.26 × 631.05
  4. Step 4: Simplify right side
    1,128.41x = 982,708.13
  5. Step 5: Solve for x
    x = 982,708.13/1,128.41
  6. Step 6: Final answer
    x = 870.88

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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.