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Finding the Fourth Proportional to 1,587.53, 2,190.95 and 879.43

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Solution

The fourth proportional to 1,587.53, 2,190.95 and 879.43 is: 1,213.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.53 : 2,190.95 = 879.43 : x
  2. Step 2: Convert to fraction form
    1,587.53/2,190.95 = 879.43/x
  3. Step 3: Cross multiply
    1,587.53x = 2,190.95 × 879.43
  4. Step 4: Simplify right side
    1,587.53x = 1,926,783.88
  5. Step 5: Solve for x
    x = 1,926,783.88/1,587.53
  6. Step 6: Final answer
    x = 1,213.70

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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.