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Finding the Fourth Proportional to 1,392.68, 2,086.70 and 611.52

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Solution

The fourth proportional to 1,392.68, 2,086.70 and 611.52 is: 916.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.68 : 2,086.70 = 611.52 : x
  2. Step 2: Convert to fraction form
    1,392.68/2,086.70 = 611.52/x
  3. Step 3: Cross multiply
    1,392.68x = 2,086.70 × 611.52
  4. Step 4: Simplify right side
    1,392.68x = 1,276,058.78
  5. Step 5: Solve for x
    x = 1,276,058.78/1,392.68
  6. Step 6: Final answer
    x = 916.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.