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Finding the Fourth Proportional to 405.27, 607.91 and 313.69

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Solution

The fourth proportional to 405.27, 607.91 and 313.69 is: 470.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.27 : 607.91 = 313.69 : x
  2. Step 2: Convert to fraction form
    405.27/607.91 = 313.69/x
  3. Step 3: Cross multiply
    405.27x = 607.91 × 313.69
  4. Step 4: Simplify right side
    405.27x = 190,693.34
  5. Step 5: Solve for x
    x = 190,693.34/405.27
  6. Step 6: Final answer
    x = 470.53

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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.