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Finding the Fourth Proportional to 1,187.54, 1,638.75 and 690.20

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Solution

The fourth proportional to 1,187.54, 1,638.75 and 690.20 is: 952.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.54 : 1,638.75 = 690.20 : x
  2. Step 2: Convert to fraction form
    1,187.54/1,638.75 = 690.20/x
  3. Step 3: Cross multiply
    1,187.54x = 1,638.75 × 690.20
  4. Step 4: Simplify right side
    1,187.54x = 1,131,065.25
  5. Step 5: Solve for x
    x = 1,131,065.25/1,187.54
  6. Step 6: Final answer
    x = 952.44

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1.5x scale

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.