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Finding the Fourth Proportional to 1,187.08, 1,638.15 and 689.89

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Solution

The fourth proportional to 1,187.08, 1,638.15 and 689.89 is: 952.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.08 : 1,638.15 = 689.89 : x
  2. Step 2: Convert to fraction form
    1,187.08/1,638.15 = 689.89/x
  3. Step 3: Cross multiply
    1,187.08x = 1,638.15 × 689.89
  4. Step 4: Simplify right side
    1,187.08x = 1,130,146.24
  5. Step 5: Solve for x
    x = 1,130,146.24/1,187.08
  6. Step 6: Final answer
    x = 952.04

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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.