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Finding the Fourth Proportional to 1,189.31, 1,641.51 and 692.01

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Solution

The fourth proportional to 1,189.31, 1,641.51 and 692.01 is: 955.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.31 : 1,641.51 = 692.01 : x
  2. Step 2: Convert to fraction form
    1,189.31/1,641.51 = 692.01/x
  3. Step 3: Cross multiply
    1,189.31x = 1,641.51 × 692.01
  4. Step 4: Simplify right side
    1,189.31x = 1,135,941.34
  5. Step 5: Solve for x
    x = 1,135,941.34/1,189.31
  6. Step 6: Final answer
    x = 955.13

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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.