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Finding the Fourth Proportional to 891.40, 1,335.48 and 776.20

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Solution

The fourth proportional to 891.40, 1,335.48 and 776.20 is: 1,162.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.40 : 1,335.48 = 776.20 : x
  2. Step 2: Convert to fraction form
    891.40/1,335.48 = 776.20/x
  3. Step 3: Cross multiply
    891.40x = 1,335.48 × 776.20
  4. Step 4: Simplify right side
    891.40x = 1,036,599.58
  5. Step 5: Solve for x
    x = 1,036,599.58/891.40
  6. Step 6: Final answer
    x = 1,162.89

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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.