Home / 1,289.12-1,780.54-1,116.60

Finding the Fourth Proportional to 1,289.12, 1,780.54 and 1,116.60

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Solution

The fourth proportional to 1,289.12, 1,780.54 and 1,116.60 is: 1,542.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.12 : 1,780.54 = 1,116.60 : x
  2. Step 2: Convert to fraction form
    1,289.12/1,780.54 = 1,116.60/x
  3. Step 3: Cross multiply
    1,289.12x = 1,780.54 × 1,116.60
  4. Step 4: Simplify right side
    1,289.12x = 1,988,150.96
  5. Step 5: Solve for x
    x = 1,988,150.96/1,289.12
  6. Step 6: Final answer
    x = 1,542.25

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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.