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Finding the Fourth Proportional to 407.16, 611.55 and 253.17

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Solution

The fourth proportional to 407.16, 611.55 and 253.17 is: 380.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.16 : 611.55 = 253.17 : x
  2. Step 2: Convert to fraction form
    407.16/611.55 = 253.17/x
  3. Step 3: Cross multiply
    407.16x = 611.55 × 253.17
  4. Step 4: Simplify right side
    407.16x = 154,826.11
  5. Step 5: Solve for x
    x = 154,826.11/407.16
  6. Step 6: Final answer
    x = 380.26

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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.