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Finding the Fourth Proportional to 820.48, 1,230.72 and 435.52

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Solution

The fourth proportional to 820.48, 1,230.72 and 435.52 is: 653.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.48 : 1,230.72 = 435.52 : x
  2. Step 2: Convert to fraction form
    820.48/1,230.72 = 435.52/x
  3. Step 3: Cross multiply
    820.48x = 1,230.72 × 435.52
  4. Step 4: Simplify right side
    820.48x = 536,003.17
  5. Step 5: Solve for x
    x = 536,003.17/820.48
  6. Step 6: Final answer
    x = 653.28

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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.