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Finding the Fourth Proportional to 631.20, 946.80 and 266.40

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Solution

The fourth proportional to 631.20, 946.80 and 266.40 is: 399.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.20 : 946.80 = 266.40 : x
  2. Step 2: Convert to fraction form
    631.20/946.80 = 266.40/x
  3. Step 3: Cross multiply
    631.20x = 946.80 × 266.40
  4. Step 4: Simplify right side
    631.20x = 252,227.52
  5. Step 5: Solve for x
    x = 252,227.52/631.20
  6. Step 6: Final answer
    x = 399.60

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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.