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Finding the Fourth Proportional to 719.50, 992.39 and 424.55

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Solution

The fourth proportional to 719.50, 992.39 and 424.55 is: 585.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.50 : 992.39 = 424.55 : x
  2. Step 2: Convert to fraction form
    719.50/992.39 = 424.55/x
  3. Step 3: Cross multiply
    719.50x = 992.39 × 424.55
  4. Step 4: Simplify right side
    719.50x = 421,319.53
  5. Step 5: Solve for x
    x = 421,319.53/719.50
  6. Step 6: Final answer
    x = 585.57

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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.