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Finding the Fourth Proportional to 926.12, 1,381.33 and 780.83

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Solution

The fourth proportional to 926.12, 1,381.33 and 780.83 is: 1,164.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.12 : 1,381.33 = 780.83 : x
  2. Step 2: Convert to fraction form
    926.12/1,381.33 = 780.83/x
  3. Step 3: Cross multiply
    926.12x = 1,381.33 × 780.83
  4. Step 4: Simplify right side
    926.12x = 1,078,583.90
  5. Step 5: Solve for x
    x = 1,078,583.90/926.12
  6. Step 6: Final answer
    x = 1,164.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.