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Finding the Fourth Proportional to 860.92, 1,188.09 and 487.95

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Solution

The fourth proportional to 860.92, 1,188.09 and 487.95 is: 673.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.92 : 1,188.09 = 487.95 : x
  2. Step 2: Convert to fraction form
    860.92/1,188.09 = 487.95/x
  3. Step 3: Cross multiply
    860.92x = 1,188.09 × 487.95
  4. Step 4: Simplify right side
    860.92x = 579,731.49
  5. Step 5: Solve for x
    x = 579,731.49/860.92
  6. Step 6: Final answer
    x = 673.39

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Double scale
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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.