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Finding the Fourth Proportional to 890.63, 1,228.64 and 692.81

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Solution

The fourth proportional to 890.63, 1,228.64 and 692.81 is: 955.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.63 : 1,228.64 = 692.81 : x
  2. Step 2: Convert to fraction form
    890.63/1,228.64 = 692.81/x
  3. Step 3: Cross multiply
    890.63x = 1,228.64 × 692.81
  4. Step 4: Simplify right side
    890.63x = 851,204.47
  5. Step 5: Solve for x
    x = 851,204.47/890.63
  6. Step 6: Final answer
    x = 955.74

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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.