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Finding the Fourth Proportional to 1,558.96, 2,151.39 and 860.34

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Solution

The fourth proportional to 1,558.96, 2,151.39 and 860.34 is: 1,187.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,558.96 : 2,151.39 = 860.34 : x
  2. Step 2: Convert to fraction form
    1,558.96/2,151.39 = 860.34/x
  3. Step 3: Cross multiply
    1,558.96x = 2,151.39 × 860.34
  4. Step 4: Simplify right side
    1,558.96x = 1,850,926.87
  5. Step 5: Solve for x
    x = 1,850,926.87/1,558.96
  6. Step 6: Final answer
    x = 1,187.28

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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.