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Finding the Fourth Proportional to 1,243.31, 1,865.16 and 421.63

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Solution

The fourth proportional to 1,243.31, 1,865.16 and 421.63 is: 632.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.31 : 1,865.16 = 421.63 : x
  2. Step 2: Convert to fraction form
    1,243.31/1,865.16 = 421.63/x
  3. Step 3: Cross multiply
    1,243.31x = 1,865.16 × 421.63
  4. Step 4: Simplify right side
    1,243.31x = 786,407.41
  5. Step 5: Solve for x
    x = 786,407.41/1,243.31
  6. Step 6: Final answer
    x = 632.51

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1.5x scale

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.