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Finding the Fourth Proportional to 860.57, 1,290.90 and 655.46

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Solution

The fourth proportional to 860.57, 1,290.90 and 655.46 is: 983.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.57 : 1,290.90 = 655.46 : x
  2. Step 2: Convert to fraction form
    860.57/1,290.90 = 655.46/x
  3. Step 3: Cross multiply
    860.57x = 1,290.90 × 655.46
  4. Step 4: Simplify right side
    860.57x = 846,133.31
  5. Step 5: Solve for x
    x = 846,133.31/860.57
  6. Step 6: Final answer
    x = 983.22

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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.