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Finding the Fourth Proportional to 1,345.74, 2,018.82 and 421.11

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Solution

The fourth proportional to 1,345.74, 2,018.82 and 421.11 is: 631.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.74 : 2,018.82 = 421.11 : x
  2. Step 2: Convert to fraction form
    1,345.74/2,018.82 = 421.11/x
  3. Step 3: Cross multiply
    1,345.74x = 2,018.82 × 421.11
  4. Step 4: Simplify right side
    1,345.74x = 850,145.29
  5. Step 5: Solve for x
    x = 850,145.29/1,345.74
  6. Step 6: Final answer
    x = 631.73

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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.