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Finding the Fourth Proportional to 1,224.05, 1,689.03 and 692.87

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Solution

The fourth proportional to 1,224.05, 1,689.03 and 692.87 is: 956.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.05 : 1,689.03 = 692.87 : x
  2. Step 2: Convert to fraction form
    1,224.05/1,689.03 = 692.87/x
  3. Step 3: Cross multiply
    1,224.05x = 1,689.03 × 692.87
  4. Step 4: Simplify right side
    1,224.05x = 1,170,269.77
  5. Step 5: Solve for x
    x = 1,170,269.77/1,224.05
  6. Step 6: Final answer
    x = 956.07

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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.