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Finding the Fourth Proportional to 890.88, 1,334.16 and 762.72

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Solution

The fourth proportional to 890.88, 1,334.16 and 762.72 is: 1,142.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.88 : 1,334.16 = 762.72 : x
  2. Step 2: Convert to fraction form
    890.88/1,334.16 = 762.72/x
  3. Step 3: Cross multiply
    890.88x = 1,334.16 × 762.72
  4. Step 4: Simplify right side
    890.88x = 1,017,590.52
  5. Step 5: Solve for x
    x = 1,017,590.52/890.88
  6. Step 6: Final answer
    x = 1,142.23

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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.