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Finding the Fourth Proportional to 821.57, 1,233.23 and 457.07

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Solution

The fourth proportional to 821.57, 1,233.23 and 457.07 is: 686.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.57 : 1,233.23 = 457.07 : x
  2. Step 2: Convert to fraction form
    821.57/1,233.23 = 457.07/x
  3. Step 3: Cross multiply
    821.57x = 1,233.23 × 457.07
  4. Step 4: Simplify right side
    821.57x = 563,663.98
  5. Step 5: Solve for x
    x = 563,663.98/821.57
  6. Step 6: Final answer
    x = 686.09

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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.