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Finding the Fourth Proportional to 821.72, 1,134.06 and 472.52

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Solution

The fourth proportional to 821.72, 1,134.06 and 472.52 is: 652.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.72 : 1,134.06 = 472.52 : x
  2. Step 2: Convert to fraction form
    821.72/1,134.06 = 472.52/x
  3. Step 3: Cross multiply
    821.72x = 1,134.06 × 472.52
  4. Step 4: Simplify right side
    821.72x = 535,866.03
  5. Step 5: Solve for x
    x = 535,866.03/821.72
  6. Step 6: Final answer
    x = 652.13

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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.