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Finding the Fourth Proportional to 899.43, 1,240.95 and 521.28

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Solution

The fourth proportional to 899.43, 1,240.95 and 521.28 is: 719.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.43 : 1,240.95 = 521.28 : x
  2. Step 2: Convert to fraction form
    899.43/1,240.95 = 521.28/x
  3. Step 3: Cross multiply
    899.43x = 1,240.95 × 521.28
  4. Step 4: Simplify right side
    899.43x = 646,882.42
  5. Step 5: Solve for x
    x = 646,882.42/899.43
  6. Step 6: Final answer
    x = 719.21

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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.