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Finding the Fourth Proportional to 719.51, 992.79 and 424.80

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Solution

The fourth proportional to 719.51, 992.79 and 424.80 is: 586.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.51 : 992.79 = 424.80 : x
  2. Step 2: Convert to fraction form
    719.51/992.79 = 424.80/x
  3. Step 3: Cross multiply
    719.51x = 992.79 × 424.80
  4. Step 4: Simplify right side
    719.51x = 421,737.19
  5. Step 5: Solve for x
    x = 421,737.19/719.51
  6. Step 6: Final answer
    x = 586.15

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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.