Home / 1,289.32-1,781.44-1,148.20

Finding the Fourth Proportional to 1,289.32, 1,781.44 and 1,148.20

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Solution

The fourth proportional to 1,289.32, 1,781.44 and 1,148.20 is: 1,586.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.32 : 1,781.44 = 1,148.20 : x
  2. Step 2: Convert to fraction form
    1,289.32/1,781.44 = 1,148.20/x
  3. Step 3: Cross multiply
    1,289.32x = 1,781.44 × 1,148.20
  4. Step 4: Simplify right side
    1,289.32x = 2,045,449.41
  5. Step 5: Solve for x
    x = 2,045,449.41/1,289.32
  6. Step 6: Final answer
    x = 1,586.46

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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.