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Finding the Fourth Proportional to 891.36, 1,335.96 and 457.20

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Solution

The fourth proportional to 891.36, 1,335.96 and 457.20 is: 685.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.36 : 1,335.96 = 457.20 : x
  2. Step 2: Convert to fraction form
    891.36/1,335.96 = 457.20/x
  3. Step 3: Cross multiply
    891.36x = 1,335.96 × 457.20
  4. Step 4: Simplify right side
    891.36x = 610,800.91
  5. Step 5: Solve for x
    x = 610,800.91/891.36
  6. Step 6: Final answer
    x = 685.25

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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.