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Finding the Fourth Proportional to 1,243.15, 1,864.77 and 421.51

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Solution

The fourth proportional to 1,243.15, 1,864.77 and 421.51 is: 632.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.15 : 1,864.77 = 421.51 : x
  2. Step 2: Convert to fraction form
    1,243.15/1,864.77 = 421.51/x
  3. Step 3: Cross multiply
    1,243.15x = 1,864.77 × 421.51
  4. Step 4: Simplify right side
    1,243.15x = 786,009.88
  5. Step 5: Solve for x
    x = 786,009.88/1,243.15
  6. Step 6: Final answer
    x = 632.28

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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.