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Finding the Fourth Proportional to 405.62, 607.74 and 319.51

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Solution

The fourth proportional to 405.62, 607.74 and 319.51 is: 478.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.62 : 607.74 = 319.51 : x
  2. Step 2: Convert to fraction form
    405.62/607.74 = 319.51/x
  3. Step 3: Cross multiply
    405.62x = 607.74 × 319.51
  4. Step 4: Simplify right side
    405.62x = 194,176.29
  5. Step 5: Solve for x
    x = 194,176.29/405.62
  6. Step 6: Final answer
    x = 478.72

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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.