Home / 1,128.60-1,557.51-631.29

Finding the Fourth Proportional to 1,128.60, 1,557.51 and 631.29

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Solution

The fourth proportional to 1,128.60, 1,557.51 and 631.29 is: 871.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.60 : 1,557.51 = 631.29 : x
  2. Step 2: Convert to fraction form
    1,128.60/1,557.51 = 631.29/x
  3. Step 3: Cross multiply
    1,128.60x = 1,557.51 × 631.29
  4. Step 4: Simplify right side
    1,128.60x = 983,240.49
  5. Step 5: Solve for x
    x = 983,240.49/1,128.60
  6. Step 6: Final answer
    x = 871.20

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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.