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Finding the Fourth Proportional to 1,719.92, 2,579.93 and 421.39

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Solution

The fourth proportional to 1,719.92, 2,579.93 and 421.39 is: 632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.92 : 2,579.93 = 421.39 : x
  2. Step 2: Convert to fraction form
    1,719.92/2,579.93 = 421.39/x
  3. Step 3: Cross multiply
    1,719.92x = 2,579.93 × 421.39
  4. Step 4: Simplify right side
    1,719.92x = 1,087,157.76
  5. Step 5: Solve for x
    x = 1,087,157.76/1,719.92
  6. Step 6: Final answer
    x = 632.10

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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.