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Finding the Fourth Proportional to 548.48, 819.40 and 438.08

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Solution

The fourth proportional to 548.48, 819.40 and 438.08 is: 654.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.48 : 819.40 = 438.08 : x
  2. Step 2: Convert to fraction form
    548.48/819.40 = 438.08/x
  3. Step 3: Cross multiply
    548.48x = 819.40 × 438.08
  4. Step 4: Simplify right side
    548.48x = 358,962.75
  5. Step 5: Solve for x
    x = 358,962.75/548.48
  6. Step 6: Final answer
    x = 654.47

Related Problems

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.