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Finding the Fourth Proportional to 1,224.10, 1,687.95 and 869.93

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Solution

The fourth proportional to 1,224.10, 1,687.95 and 869.93 is: 1,199.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.10 : 1,687.95 = 869.93 : x
  2. Step 2: Convert to fraction form
    1,224.10/1,687.95 = 869.93/x
  3. Step 3: Cross multiply
    1,224.10x = 1,687.95 × 869.93
  4. Step 4: Simplify right side
    1,224.10x = 1,468,398.34
  5. Step 5: Solve for x
    x = 1,468,398.34/1,224.10
  6. Step 6: Final answer
    x = 1,199.57

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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.