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Finding the Fourth Proportional to 860.53, 1,187.86 and 674.08

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Solution

The fourth proportional to 860.53, 1,187.86 and 674.08 is: 930.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.53 : 1,187.86 = 674.08 : x
  2. Step 2: Convert to fraction form
    860.53/1,187.86 = 674.08/x
  3. Step 3: Cross multiply
    860.53x = 1,187.86 × 674.08
  4. Step 4: Simplify right side
    860.53x = 800,712.67
  5. Step 5: Solve for x
    x = 800,712.67/860.53
  6. Step 6: Final answer
    x = 930.49

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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.