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Finding the Fourth Proportional to 860.76, 1,290.21 and 630.63

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Solution

The fourth proportional to 860.76, 1,290.21 and 630.63 is: 945.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.76 : 1,290.21 = 630.63 : x
  2. Step 2: Convert to fraction form
    860.76/1,290.21 = 630.63/x
  3. Step 3: Cross multiply
    860.76x = 1,290.21 × 630.63
  4. Step 4: Simplify right side
    860.76x = 813,645.13
  5. Step 5: Solve for x
    x = 813,645.13/860.76
  6. Step 6: Final answer
    x = 945.26

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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.