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Finding the Fourth Proportional to 1,393.76, 1,923.20 and 772.80

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Solution

The fourth proportional to 1,393.76, 1,923.20 and 772.80 is: 1,066.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.76 : 1,923.20 = 772.80 : x
  2. Step 2: Convert to fraction form
    1,393.76/1,923.20 = 772.80/x
  3. Step 3: Cross multiply
    1,393.76x = 1,923.20 × 772.80
  4. Step 4: Simplify right side
    1,393.76x = 1,486,248.96
  5. Step 5: Solve for x
    x = 1,486,248.96/1,393.76
  6. Step 6: Final answer
    x = 1,066.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.