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Finding the Fourth Proportional to 423.60, 631.92 and 386.88

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Solution

The fourth proportional to 423.60, 631.92 and 386.88 is: 577.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.60 : 631.92 = 386.88 : x
  2. Step 2: Convert to fraction form
    423.60/631.92 = 386.88/x
  3. Step 3: Cross multiply
    423.60x = 631.92 × 386.88
  4. Step 4: Simplify right side
    423.60x = 244,477.21
  5. Step 5: Solve for x
    x = 244,477.21/423.60
  6. Step 6: Final answer
    x = 577.14

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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.