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Finding the Fourth Proportional to 926.80, 1,390.20 and 494.80

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Solution

The fourth proportional to 926.80, 1,390.20 and 494.80 is: 742.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.80 : 1,390.20 = 494.80 : x
  2. Step 2: Convert to fraction form
    926.80/1,390.20 = 494.80/x
  3. Step 3: Cross multiply
    926.80x = 1,390.20 × 494.80
  4. Step 4: Simplify right side
    926.80x = 687,870.96
  5. Step 5: Solve for x
    x = 687,870.96/926.80
  6. Step 6: Final answer
    x = 742.20

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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.