Home / 1,587.30-2,190.43-879.18

Finding the Fourth Proportional to 1,587.30, 2,190.43 and 879.18

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Solution

The fourth proportional to 1,587.30, 2,190.43 and 879.18 is: 1,213.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.30 : 2,190.43 = 879.18 : x
  2. Step 2: Convert to fraction form
    1,587.30/2,190.43 = 879.18/x
  3. Step 3: Cross multiply
    1,587.30x = 2,190.43 × 879.18
  4. Step 4: Simplify right side
    1,587.30x = 1,925,766.90
  5. Step 5: Solve for x
    x = 1,925,766.90/1,587.30
  6. Step 6: Final answer
    x = 1,213.23

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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.