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Finding the Fourth Proportional to 891.24, 1,336.51 and 428.91

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Solution

The fourth proportional to 891.24, 1,336.51 and 428.91 is: 643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.24 : 1,336.51 = 428.91 : x
  2. Step 2: Convert to fraction form
    891.24/1,336.51 = 428.91/x
  3. Step 3: Cross multiply
    891.24x = 1,336.51 × 428.91
  4. Step 4: Simplify right side
    891.24x = 573,242.50
  5. Step 5: Solve for x
    x = 573,242.50/891.24
  6. Step 6: Final answer
    x = 643.20

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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.