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Finding the Fourth Proportional to 1,187.16, 1,638.37 and 689.95

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Solution

The fourth proportional to 1,187.16, 1,638.37 and 689.95 is: 952.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.16 : 1,638.37 = 689.95 : x
  2. Step 2: Convert to fraction form
    1,187.16/1,638.37 = 689.95/x
  3. Step 3: Cross multiply
    1,187.16x = 1,638.37 × 689.95
  4. Step 4: Simplify right side
    1,187.16x = 1,130,393.38
  5. Step 5: Solve for x
    x = 1,130,393.38/1,187.16
  6. Step 6: Final answer
    x = 952.18

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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.