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Finding the Fourth Proportional to 860.04, 1,288.90 and 627.84

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Solution

The fourth proportional to 860.04, 1,288.90 and 627.84 is: 940.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.04 : 1,288.90 = 627.84 : x
  2. Step 2: Convert to fraction form
    860.04/1,288.90 = 627.84/x
  3. Step 3: Cross multiply
    860.04x = 1,288.90 × 627.84
  4. Step 4: Simplify right side
    860.04x = 809,219.84
  5. Step 5: Solve for x
    x = 809,219.84/860.04
  6. Step 6: Final answer
    x = 940.91

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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.