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Finding the Fourth Proportional to 1,345.88, 2,018.92 and 421.44

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Solution

The fourth proportional to 1,345.88, 2,018.92 and 421.44 is: 632.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.88 : 2,018.92 = 421.44 : x
  2. Step 2: Convert to fraction form
    1,345.88/2,018.92 = 421.44/x
  3. Step 3: Cross multiply
    1,345.88x = 2,018.92 × 421.44
  4. Step 4: Simplify right side
    1,345.88x = 850,853.64
  5. Step 5: Solve for x
    x = 850,853.64/1,345.88
  6. Step 6: Final answer
    x = 632.19

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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.