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Finding the Fourth Proportional to 1,345.96, 2,018.94 and 421.53

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Solution

The fourth proportional to 1,345.96, 2,018.94 and 421.53 is: 632.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.96 : 2,018.94 = 421.53 : x
  2. Step 2: Convert to fraction form
    1,345.96/2,018.94 = 421.53/x
  3. Step 3: Cross multiply
    1,345.96x = 2,018.94 × 421.53
  4. Step 4: Simplify right side
    1,345.96x = 851,033.68
  5. Step 5: Solve for x
    x = 851,033.68/1,345.96
  6. Step 6: Final answer
    x = 632.29

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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.