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Finding the Fourth Proportional to 1,335.18, 1,842.49 and 775.80

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Solution

The fourth proportional to 1,335.18, 1,842.49 and 775.80 is: 1,070.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.18 : 1,842.49 = 775.80 : x
  2. Step 2: Convert to fraction form
    1,335.18/1,842.49 = 775.80/x
  3. Step 3: Cross multiply
    1,335.18x = 1,842.49 × 775.80
  4. Step 4: Simplify right side
    1,335.18x = 1,429,406.41
  5. Step 5: Solve for x
    x = 1,429,406.41/1,335.18
  6. Step 6: Final answer
    x = 1,070.58

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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.