Home / 1,128.59-1,557.39-631.25

Finding the Fourth Proportional to 1,128.59, 1,557.39 and 631.25

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Solution

The fourth proportional to 1,128.59, 1,557.39 and 631.25 is: 871.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.59 : 1,557.39 = 631.25 : x
  2. Step 2: Convert to fraction form
    1,128.59/1,557.39 = 631.25/x
  3. Step 3: Cross multiply
    1,128.59x = 1,557.39 × 631.25
  4. Step 4: Simplify right side
    1,128.59x = 983,102.44
  5. Step 5: Solve for x
    x = 983,102.44/1,128.59
  6. Step 6: Final answer
    x = 871.09

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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.