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Finding the Fourth Proportional to 407.99, 612.19 and 253.88

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Solution

The fourth proportional to 407.99, 612.19 and 253.88 is: 380.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.99 : 612.19 = 253.88 : x
  2. Step 2: Convert to fraction form
    407.99/612.19 = 253.88/x
  3. Step 3: Cross multiply
    407.99x = 612.19 × 253.88
  4. Step 4: Simplify right side
    407.99x = 155,421.53
  5. Step 5: Solve for x
    x = 155,421.53/407.99
  6. Step 6: Final answer
    x = 380.94

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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.