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Finding the Fourth Proportional to 860.74, 1,187.76 and 487.77

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Solution

The fourth proportional to 860.74, 1,187.76 and 487.77 is: 673.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.74 : 1,187.76 = 487.77 : x
  2. Step 2: Convert to fraction form
    860.74/1,187.76 = 487.77/x
  3. Step 3: Cross multiply
    860.74x = 1,187.76 × 487.77
  4. Step 4: Simplify right side
    860.74x = 579,357.75
  5. Step 5: Solve for x
    x = 579,357.75/860.74
  6. Step 6: Final answer
    x = 673.09

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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.