Home / 1,585.12-2,188.20-921.73

Finding the Fourth Proportional to 1,585.12, 2,188.20 and 921.73

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Solution

The fourth proportional to 1,585.12, 2,188.20 and 921.73 is: 1,272.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.12 : 2,188.20 = 921.73 : x
  2. Step 2: Convert to fraction form
    1,585.12/2,188.20 = 921.73/x
  3. Step 3: Cross multiply
    1,585.12x = 2,188.20 × 921.73
  4. Step 4: Simplify right side
    1,585.12x = 2,016,929.59
  5. Step 5: Solve for x
    x = 2,016,929.59/1,585.12
  6. Step 6: Final answer
    x = 1,272.41

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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.