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Finding the Fourth Proportional to 1,345.87, 2,018.13 and 421.48

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Solution

The fourth proportional to 1,345.87, 2,018.13 and 421.48 is: 632.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.87 : 2,018.13 = 421.48 : x
  2. Step 2: Convert to fraction form
    1,345.87/2,018.13 = 421.48/x
  3. Step 3: Cross multiply
    1,345.87x = 2,018.13 × 421.48
  4. Step 4: Simplify right side
    1,345.87x = 850,601.43
  5. Step 5: Solve for x
    x = 850,601.43/1,345.87
  6. Step 6: Final answer
    x = 632.01

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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.