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Finding the Fourth Proportional to 548.16, 822.60 and 420.72

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Solution

The fourth proportional to 548.16, 822.60 and 420.72 is: 631.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.16 : 822.60 = 420.72 : x
  2. Step 2: Convert to fraction form
    548.16/822.60 = 420.72/x
  3. Step 3: Cross multiply
    548.16x = 822.60 × 420.72
  4. Step 4: Simplify right side
    548.16x = 346,084.27
  5. Step 5: Solve for x
    x = 346,084.27/548.16
  6. Step 6: Final answer
    x = 631.36

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1.5x scale

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.