Home / 1,128.49-1,557.34-631.13

Finding the Fourth Proportional to 1,128.49, 1,557.34 and 631.13

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Solution

The fourth proportional to 1,128.49, 1,557.34 and 631.13 is: 870.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.49 : 1,557.34 = 631.13 : x
  2. Step 2: Convert to fraction form
    1,128.49/1,557.34 = 631.13/x
  3. Step 3: Cross multiply
    1,128.49x = 1,557.34 × 631.13
  4. Step 4: Simplify right side
    1,128.49x = 982,874.63
  5. Step 5: Solve for x
    x = 982,874.63/1,128.49
  6. Step 6: Final answer
    x = 870.97

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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.