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Finding the Fourth Proportional to 719.79, 993.30 and 405.05

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Solution

The fourth proportional to 719.79, 993.30 and 405.05 is: 558.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.79 : 993.30 = 405.05 : x
  2. Step 2: Convert to fraction form
    719.79/993.30 = 405.05/x
  3. Step 3: Cross multiply
    719.79x = 993.30 × 405.05
  4. Step 4: Simplify right side
    719.79x = 402,339.41
  5. Step 5: Solve for x
    x = 402,339.41/719.79
  6. Step 6: Final answer
    x = 558.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.