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Finding the Fourth Proportional to 901.21, 1,243.62 and 502.87

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Solution

The fourth proportional to 901.21, 1,243.62 and 502.87 is: 693.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.21 : 1,243.62 = 502.87 : x
  2. Step 2: Convert to fraction form
    901.21/1,243.62 = 502.87/x
  3. Step 3: Cross multiply
    901.21x = 1,243.62 × 502.87
  4. Step 4: Simplify right side
    901.21x = 625,379.19
  5. Step 5: Solve for x
    x = 625,379.19/901.21
  6. Step 6: Final answer
    x = 693.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.