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Finding the Fourth Proportional to 860.76, 1,290.24 and 426.96

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Solution

The fourth proportional to 860.76, 1,290.24 and 426.96 is: 639.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.76 : 1,290.24 = 426.96 : x
  2. Step 2: Convert to fraction form
    860.76/1,290.24 = 426.96/x
  3. Step 3: Cross multiply
    860.76x = 1,290.24 × 426.96
  4. Step 4: Simplify right side
    860.76x = 550,880.87
  5. Step 5: Solve for x
    x = 550,880.87/860.76
  6. Step 6: Final answer
    x = 639.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.