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Finding the Fourth Proportional to 405.07, 607.18 and 212.83

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Solution

The fourth proportional to 405.07, 607.18 and 212.83 is: 319.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.07 : 607.18 = 212.83 : x
  2. Step 2: Convert to fraction form
    405.07/607.18 = 212.83/x
  3. Step 3: Cross multiply
    405.07x = 607.18 × 212.83
  4. Step 4: Simplify right side
    405.07x = 129,226.12
  5. Step 5: Solve for x
    x = 129,226.12/405.07
  6. Step 6: Final answer
    x = 319.02

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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.