Home / 1,539.12-2,118.54-1,287.66

Finding the Fourth Proportional to 1,539.12, 2,118.54 and 1,287.66

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Solution

The fourth proportional to 1,539.12, 2,118.54 and 1,287.66 is: 1,772.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.12 : 2,118.54 = 1,287.66 : x
  2. Step 2: Convert to fraction form
    1,539.12/2,118.54 = 1,287.66/x
  3. Step 3: Cross multiply
    1,539.12x = 2,118.54 × 1,287.66
  4. Step 4: Simplify right side
    1,539.12x = 2,727,959.22
  5. Step 5: Solve for x
    x = 2,727,959.22/1,539.12
  6. Step 6: Final answer
    x = 1,772.41

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1.5x scale

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.