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Finding the Fourth Proportional to 1,358.50, 1,873.74 and 860.66

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Solution

The fourth proportional to 1,358.50, 1,873.74 and 860.66 is: 1,187.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.50 : 1,873.74 = 860.66 : x
  2. Step 2: Convert to fraction form
    1,358.50/1,873.74 = 860.66/x
  3. Step 3: Cross multiply
    1,358.50x = 1,873.74 × 860.66
  4. Step 4: Simplify right side
    1,358.50x = 1,612,653.07
  5. Step 5: Solve for x
    x = 1,612,653.07/1,358.50
  6. Step 6: Final answer
    x = 1,187.08

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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.