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Finding the Fourth Proportional to 820.14, 1,132.72 and 554.12

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Solution

The fourth proportional to 820.14, 1,132.72 and 554.12 is: 765.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.14 : 1,132.72 = 554.12 : x
  2. Step 2: Convert to fraction form
    820.14/1,132.72 = 554.12/x
  3. Step 3: Cross multiply
    820.14x = 1,132.72 × 554.12
  4. Step 4: Simplify right side
    820.14x = 627,666.38
  5. Step 5: Solve for x
    x = 627,666.38/820.14
  6. Step 6: Final answer
    x = 765.31

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1.5x scale

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.