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Finding the Fourth Proportional to 1,345.71, 2,018.79 and 421.36

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Solution

The fourth proportional to 1,345.71, 2,018.79 and 421.36 is: 632.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.71 : 2,018.79 = 421.36 : x
  2. Step 2: Convert to fraction form
    1,345.71/2,018.79 = 421.36/x
  3. Step 3: Cross multiply
    1,345.71x = 2,018.79 × 421.36
  4. Step 4: Simplify right side
    1,345.71x = 850,637.35
  5. Step 5: Solve for x
    x = 850,637.35/1,345.71
  6. Step 6: Final answer
    x = 632.11

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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.