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Finding the Fourth Proportional to 378.64, 567.60 and 147.16

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Solution

The fourth proportional to 378.64, 567.60 and 147.16 is: 220.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.64 : 567.60 = 147.16 : x
  2. Step 2: Convert to fraction form
    378.64/567.60 = 147.16/x
  3. Step 3: Cross multiply
    378.64x = 567.60 × 147.16
  4. Step 4: Simplify right side
    378.64x = 83,528.02
  5. Step 5: Solve for x
    x = 83,528.02/378.64
  6. Step 6: Final answer
    x = 220.60

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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.