Home / 1,140.60-1,580.64-1,118.70

Finding the Fourth Proportional to 1,140.60, 1,580.64 and 1,118.70

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Solution

The fourth proportional to 1,140.60, 1,580.64 and 1,118.70 is: 1,550.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.60 : 1,580.64 = 1,118.70 : x
  2. Step 2: Convert to fraction form
    1,140.60/1,580.64 = 1,118.70/x
  3. Step 3: Cross multiply
    1,140.60x = 1,580.64 × 1,118.70
  4. Step 4: Simplify right side
    1,140.60x = 1,768,261.97
  5. Step 5: Solve for x
    x = 1,768,261.97/1,140.60
  6. Step 6: Final answer
    x = 1,550.29

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.