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Finding the Fourth Proportional to 1,458.11, 2,012.89 and 860.39

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Solution

The fourth proportional to 1,458.11, 2,012.89 and 860.39 is: 1,187.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,458.11 : 2,012.89 = 860.39 : x
  2. Step 2: Convert to fraction form
    1,458.11/2,012.89 = 860.39/x
  3. Step 3: Cross multiply
    1,458.11x = 2,012.89 × 860.39
  4. Step 4: Simplify right side
    1,458.11x = 1,731,875.85
  5. Step 5: Solve for x
    x = 1,731,875.85/1,458.11
  6. Step 6: Final answer
    x = 1,187.75

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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.