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Finding the Fourth Proportional to 719.21, 992.47 and 404.53

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Solution

The fourth proportional to 719.21, 992.47 and 404.53 is: 558.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.21 : 992.47 = 404.53 : x
  2. Step 2: Convert to fraction form
    719.21/992.47 = 404.53/x
  3. Step 3: Cross multiply
    719.21x = 992.47 × 404.53
  4. Step 4: Simplify right side
    719.21x = 401,483.89
  5. Step 5: Solve for x
    x = 401,483.89/719.21
  6. Step 6: Final answer
    x = 558.23

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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.