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Finding the Fourth Proportional to 860.68, 1,188.30 and 628.84

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Solution

The fourth proportional to 860.68, 1,188.30 and 628.84 is: 868.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.68 : 1,188.30 = 628.84 : x
  2. Step 2: Convert to fraction form
    860.68/1,188.30 = 628.84/x
  3. Step 3: Cross multiply
    860.68x = 1,188.30 × 628.84
  4. Step 4: Simplify right side
    860.68x = 747,250.57
  5. Step 5: Solve for x
    x = 747,250.57/860.68
  6. Step 6: Final answer
    x = 868.21

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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.