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Finding the Fourth Proportional to 1,587.52, 2,190.78 and 879.40

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Solution

The fourth proportional to 1,587.52, 2,190.78 and 879.40 is: 1,213.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.52 : 2,190.78 = 879.40 : x
  2. Step 2: Convert to fraction form
    1,587.52/2,190.78 = 879.40/x
  3. Step 3: Cross multiply
    1,587.52x = 2,190.78 × 879.40
  4. Step 4: Simplify right side
    1,587.52x = 1,926,571.93
  5. Step 5: Solve for x
    x = 1,926,571.93/1,587.52
  6. Step 6: Final answer
    x = 1,213.57

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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.